Scite A free source code editor for Win32 and X. GPL Programming

Audacity Wave/Audio editor. Will export to mp3 using Lame and takes vst plugins, plus other effects plugins. Highly recommended. GPL Audio

Flac Lossless audio compression tool. Rips tracks without the quality loss like you find in mp3 format. GPL Audio

MacKeySynth Very cool synth with 128 sounds + drums, octave changes and it can be played directly from your computer keys. OS X version soon to come. Freeware Audio

MidiKeys Keybord to midi virtual midi board. Freeware Audio

LameBrain MP3 ripper, very nice ripper. Freeware Audio

Mixx Dj software. GPL Audio

Fluidsynth FluidSynth is a real-time software synthesizer based on the SoundFont 2 specifications. FluidSynth can read MIDI events from a MIDI input device and render them to an audio device using SoundFont instruments. GPL Audio

IVideo Digital video editing and processing. GPL Video

Jahshaka Nice video editor. Really worth the download. Under a new name of CineFX GPL Video

VideoLan Movie player, plays most everything including AVI and DVD. GPL Video

Cinepaint Image editor geared for video production. GPL 2D Graphics

EOS Image Manager Really kick ass image manager and viewer. Highly recommended. GPL 2D Graphics

Quickview Image viewer for Finder. Freeware 2D Graphics

Pixen2 This is a pixel artist's wet dream. Nice for icon creation too. Highly recommended. MIT 2D Graphics

Xaos Fractal generator. GPL 2D Graphics

Fractal Trees Fractal tree generator. GPL 2D Graphics

The Gimp Image editor much like Photoshop packaged for OS X. Highly recommended. Also see Gimp official site GPL 2D Graphics

Gimpshop Gimp organized more like Photoshop. GPL 2D Graphics

Seashore Image editor for OS X. Similar to Photoshop. GPL 2D Graphics

Mac PovRay Open 3-D design for OS X. GPL 3D Graphics

Blender 3-D 3-D design, animation, game development for OS X. Highly recommended. GPL 3D Graphics

Dusty Dusty is a nice realtime 3D Smoke Simulator. It allowes to simulate smoke and fire in realtime. Freeware 3D Graphics

Arbaro Make 3-D trees. GPL 3D Graphics

Daz Studio 3-D app for Poser type figures - very nice! Freeware 3D Graphics

Wings3d Wings 3D is a 3-D subdivision modeler inspired by Nendo and Mirai from Izware. GPL 3D Graphics

UVMapper Map textures to 3-D objects. Freeware/Other 3D Graphics

White_Dune White_dune is a low level VRML97 tool. GPL Programming

Hugin - Panorama Tools Make panoramic photos out of normal images. GPL 2D Graphics

X-ColorZ Helps web designers to obtain hexadecimal color codes. Freeware Web

YuBurner cd/dvd burner. GPL Utility

OSEx DVD Backup/ripping. Encrypted=yes. Freeware Video

JBidWatcher Track eBay bidding/selling. GPL Misc

AMule Peer2peer file sharing app. GPL Peer2Peer

Chicken Of the VNC Remote Desktop tool for MAC. GPL Utility

OSX2x osx2x is like dual monitors, a kvm switch, and vnc on speed! If you want to operate multiple machines with one keyboard and mouse, move files between them, and have both screens at your disposal this is for you. Works between platforms also! See Synergy, more mature project. BSD Utility

Synergy osx2x is like dual monitors, a kvm switch, and vnc on speed! If you want to operate multiple machines with one keyboard and mouse, move files between them, and have both screens at your disposal this is for you. Works between platforms also! GPL Utility

Books2burn Converts text into voice audio. GPL Utility

ReadItToMe Have your Mac read the news to you. Uses RSS feeds. GPL Web

Adium Chat client. Supported protocols AOL (Including ICQ and .Mac), Jabber (Including Google Talk), MSN Messenger, Yahoo! (Including Yahoo! Japan), etc. Also has file transfer and encryption. GPL Chat

WSManager Multiple desktops in OS X. GPL Utility

XShelf XShelf enhances drag and drop in MacOS X by letting you "pause" drag and drop operations, as well as have multiple drag and drop operations in flight at once. Freeware Utility

DiskInventoryX File/Disk management. GPL Utility

Tinker Tool Get more tweeking in the Sys Pref. Freeware Utility

Nice iPhoto plugin Add more functionality to iPhoto. Freeware Utility

Yemuzip Nice zip utility for MAC. Free for non-commercial use. Freeware/Other Utility

Bzip2 Open source zip utility for mac. GPL Utility

MenuMeters A majorly awesome sys metering app! Highly recommended. GPL Utility

Gauchosoft XRG is a majorly awesome sys metering app! GPL Utility

MacTelnet Telnet utility LGPL Network

Aqualess View terminal output in a separate window. GPL Utility

Abiword Word processor, with spell check, formatting, translation, etc. Highly recommended. GPL Office

OpenOffice.org Office suite, like Microsoft Office and compatable with MS Office formats. Word processor, Spreadsheets, Publisher, Presentation, HTML, and Powerful database (like Access) products. Impress (Like Powerpoint) exports to many formats including SWF (Flash). All can be exported as PDF. GPL/LGPL/SISSL Office

NeoOffice Port for Open Office to run native on OS X! This is easier to deal with than Open Office at the moment. A must have if you need Office products on your Mac. GPL Office

Quasar Nice replacement for Quickbooks. Freeware/Other Finance

QCad Autocad application. See community edition. GPL 3D Graphics

UEdit Text and code editor. Freeware Text/Programming

IJournal The Official LiveJournal Client for Mac OS X. BSD Web

Phoenix Update your LiveJournal with ease. Highly recommended. GPL Web

Eclipse Eclipse java IDE for OS X. EPL Programming

OpenLaszlo Easy, Powerful and Free Flash creation, plus much more. For everything you need for this visit my Laszlo article. This isn't a OS X article, but it has links to other things you need to get the full power of Laszlo. CPL Programming

NVU HTML wysiwyg editor, supports CSS, Javascript, etc. Highly recommended. MPL/LGPL/GPL Programming

SimpleCSS CSS Editor. Freeware Programming

SPE If your a Python programmer working on Mac or Windows and your looking for a kick ass IDE Spe is for you! Highly recommended. GPL Programming

FScript IDE for the lightweight object-oriented interactive and scripting layer specifically designed for the Mac OS X object system (i.e. Cocoa). GPL Programming

DotGNU Free .Net for Linux/Mac; C#, web services, and all that jazz... GPL Programming

Fink Get the Linux software easily, lists, downloads, and installs or compiles it! GPL Utility

Fink Commander Screw using the command line! Graphical frontend for Fink. GPL Utility

WDFink Another gui frontend for Fink. GPL Utility

Hydrogen Drum and synth application like Fruityloops. If you have a Linux box try LMMS. Hell, LMMS might build on OS X. GPL Audio

Konfabulator II Desktop widgets and toys. Now owned by Yahoo. Freeware Utility

Quicksilver Launcher and much more, too much to list here... Freeware Utility

Jackosx Audio server. If you plan to make music you will want this eventually. GPL Audio

Ardour Ardour is a digital audio workstation. You can use it to record, edit and mix multi-track audio. Produce your own CD's. Mix video soundtracks. GPL Audio

Cyberduck Cyberduck is a open source FTP and SFTP (SSH Secure File Transfer) browser licenced under the GPL with an easy to use interface, integration with external editors and support for many Mac OS X system technologies such as Spotlight, Bonjour, the Keychain and AppleScript. Highly recommended. GPL Web

JEdit Jedit is a mature and well-designed programmer's text editor with a big focus on Java. Has nice Jython support! BSD/GPL Text/Programming

Sepy Flash Actionscript IDE. This is really nice! Has class list, auto complete, and compiler. Highly recommended. GPL Programming

Handbrake DVD Ripper and transcoder. In conjunction with iDVD you can't find a better solution for backing up your movies. GPL Video

Inkscape Illustration (vector) application, similar to Illustrator. The interface may be more friendly to an Adobe person than Sodipodi. Highly recommended. GPL 2D Graphics

Sodipodi Illustration (vector) application, similar to Illustrator. Available via Fink, you will not find an installer at Sodipodi website. Requires x11. GPL 2D Graphics

Shiira Web browser - VERY COOL AND FAST. Highly recommended. BSD Web

Transmission Bitorrent client. GPL Peer2Peer

MPlayer Video player. GPL Video

RSS Owl RSS news reader. CPL Web

MLDonkey Multi-platform, multi-network peer-to-peer client. It supports several large networks such as eDonkey, Overnet, Bittorrent, Gnutella (Bearshare, Limewire, etc.), Gnutella2 (Shareaza), Fasttrack (Kazaa, Imesh, Grobster), Soulseek, Direct-Connect, and Opennap. GPL Peer2Peer

OpenTaxSolver Free program for calculating Tax Form entries and tax-owed or refund-due, such as Federal or State personal income taxes. Optional OTS_GUI GPL Finance

Flame Fractal Flames are algorithmically generated images and animations. GPL 2D Graphics

SFLphone The SFLphone project aims to provide a multi-platform, multi-protocol (SIP/IAX2), and multi-GUI desktop VoIP phone. GPL Web

IStumbler IStumbler is a small utility for finding local wireless networks and services. iStumbler combines a compact Aqua user interface with advanced wireless scanning and reporting. BSD Utility

CALAMAR Calamar is a multiple client general ledger accounting program for small companies. GPL Finance

PlanetGenesis PlanetGenesis is a tool that generates 16-bit PNG height fields, Wavefront OBJ files, and POV-RAY mesh2 files for use as landscapes and planets. BSD 3D Graphics

OSXNews OSXnews is a small, fast Cocoa news reader. BSD Web

Pegasus Mail Email client, very mature and feature rich. Freeware Web

Grisbi Personnal accounting application. GPL Finance

Divx DivX player. Freeware Video

Macam Web cam drivers/software. GPL Video

BlitzMax IDE Basic programming IDE for use with the Blitz game development environment. Public Domain Programming

FreeWRL VRML web browser. GPL Web

Colloquy IRC Client. Traditionally, chat clients on the Mac have been anything but glamorous. Colloquy is an advanced IRC & SILC client which aims to fill this void. GPL Chat

Joustedit HTML editor with really nice features. GPL Programming

Applejack Troubleshooting assistant for Mac OS X. With AppleJack you can troubleshoot a computer even if you can't load the GUI, or don't have a startup CD handy. GPL Utility

Hexfiend Hex Editor. BSD Utility

Simply Burns Really nice cd/dvd burner for OS X 10.9+ GPL Utility

Flash 4 Linux You will most likely need to compile this. There may be a Fink package, but I haven't looked. GPL Programming

Fugu Secure FTP frontend. GPL Web

Goliath Goliath is an application that creates and edits websites. It uses a technology called WebDAV (frequently called Web Folders) to make changes to the files stored on web servers. GPL Programming

ProFTPd FTP Server. GPL Server

PureFTPd FTP Server where the focus is on simplicity. Manager Software Here GPL Server

Onebutton FTP FTP Client, very simple. GPL Web

Avidemux Video editor. GPL Video

Fontforge Font creation application. GPL Font

Doubletype Font creation application. GPL Font

Ogg Vorbis Ogg is like an open source version of mp3. They list many ripping, playing, and utilities on their site also for use with this format. I like it better than mp3. GPL Audio

Mucommander File Explorer replacement. If you liked Norton Commander you will love this. Freeware Utility

Locomotive Instant Rails is a one-stop Rails runtime solution containing Ruby, Rails, Apache, and MySQL. GPL Server

Apache Tomcat Apache Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages (jsp) technologies. ASF/GPL/Other Server

Apache Web Server Web Server, the best imo. Acache is most likely already installed on OS X. ASF/GPL/Other Server

MySQL SQL Database. GPL/Other Database

Postgresql SQL database. Heavy duty relational database. BSD Database

PHP Web programming language used to make PHP server pages. PHP Programming

Pidgin Chat client. It is compatible with AIM and ICQ (Oscar protocol), MSN Messenger, Yahoo!, IRC, Jabber, Gadu-Gadu, SILC, GroupWise Messenger, and Zephyr networks. GPL Chat

Skype Internet phone. Skype is a little program for making free calls over the internet to anyone else who also has Skype. Its free and easy to download and use, and works with most computers so your not limited to call friends using the same operating system. Skype also has other services that allow the calling of actual phone number and cells, plus video options for a small price. Freeware Web

Limewire Peer2peer software. Freeware/Other Peer2Peer

Synfig Cartoon animation - industrial-strength vector-based 2D animation software package, designed from the ground-up for producing feature-film quality animation with fewer people and resources. Highly Recommended. GPL Video

PGP A free encryption software program that is the de-facto global standard for E-mail and file privacy. Pretty Good Privacy (or PGP) offers full-strength, 128-bit encryption. PGP has constantly been upgraded over the years and now offers loads of useful features, including secure file wiping; advanced keyserver searching; and seamless integration with Qualcomm's popular Eudora E-mail client. Freeware/Other Security

Swami Sampled Waveforms And Musical Instruments - is an advanced instrument editor for MIDI music composition and a sampler frontend. Currently SoundFont files can be browsed, edited and saved and new instrument formats are being added (DLS and GigaSampler) in the Swami development version. Requires x11. GPL Audio

ClamAV Anti virus program. GPL Utility

Vex Vex is an editor for XML documents. The "visual" part comes from the fact that Vex hides the raw XML tags from the user, providing instead a wordprocessor-like interface. Because of this, Vex is best suited for "document-style" XML documents such as XHTML and DocBook rather than "data-style" XML documents. GPL Programming

Celtx Celtx is a comprehensive software package designed for people who work in the film, TV, theatre, and new media industries. It combines full-feature scriptwriting with media rich pre-production support and enables online collaboration. MPL Video

Jgraphpaper Graph paper creator. My wife actually needed something to do this easily maybe you do too. GPL Utility

Xerlin XML editor. GPL Programming

Juice If you want to listen to podcasts, this program is for you. GPL Web

Delineate Raster to Vector coverter. Nice GPL 2D Graphics

Preferential Treatment Preference file checker/fixer. GPL Utility

Jap Anonymous proxy. JAP makes it possible to surf the internet anonymously and unobservably. GPL Security

Chimoo Timer, can be used to time many things. Freeware Utility

Speak-freely Voice over ip, Internet phone. GPL Web

Freeguide-tv FreeGuide is a TV guide. Download TV listings from the Internet, view them offline, create a personalised TV guide and choose favourites. It uses the XMLTV tools to grab listings for lots of different countries. GPL Misc

Ktoon Cartoon drawing and animation software. GPL Video

K3D 3-D design, illustration, modelling, and animation which can utilize Renderman engine as well as others. GPL 3D Graphics

Sketch It Up 3-D design, illustration, and modelling brought to by Google. Freeware/other 3D Graphics

Selenium Web application test tool. Tests run directly in a browser, including Internet Explorer, Mozilla, and Firefox. Supported platforms Windows, Linux, and Macintosh. Languages include C#, Python, PHP, Ruby, etc. GPL Programming

Equinox3d 3-D illustration, modeling, rendering, and animation application. Shareware 3D Graphics

LiveQuartz Image editor. Unknown 2D Graphics

Gardensketch Lanscape designer. GPL 2D Graphics

Jpatch Spline based 3D modeling tool (a patch modeler). It can be used to create 3D models for POV-Ray or RenderMan compatible renderers (e.g. Aqsis). GPL 3D Graphics

Junkmatcher Spam filter for Apple's Mail client. GPL Utility

Aptana Development environment geared towards web development, Ajax style! Autocomplete and assistance for HTML, CSS, Java Script. EPL Programming

Max Max is an application for creating high-quality audio files in various formats, from compact discs or files. GPL Audio

Mamp The abbreviation MAMP stands for: Macintosh, Apache, Mysql and PHP. With just a few mouse-clicks, you can install Apache, PHP and MySQL for Mac OS X! GPL Server

ClamXav ClamXav is a free virus checker for Mac OS X. It uses the tried, tested and very popular ClamAV open source antivirus engine as a back end. GPL Utility

Miro Internet Video/podcast oraginizer player -Quicktime, WMV, MPEG, AVI, XVID, and more. Video blog, YouTube, hell it does everything including BitTorrent. GPL Video

BitTyrant BitTorrent protocol compatible client. Faster than traditional BitTorrent. GPL Peer2Peer

Hymn The purpose of the Hymn Project is to allow you to exercise your fair-use rights under copyright law. The various software provided on this web site allows you to free your iTunes Music Store purchases (protected AAC / .m4p) from their DRM restrictions with no loss of sound quality. These songs can then be played outside of the iTunes environment, even on operating systems not supported by iTunes and on hardware not supported by Apple. GPL Audio

EmailXT EmailXT is an open, patent-free protocol that replaces your current email with a more secure, full-featured system. EmailXT is a relationship-based email system where unauthorized bulk emailing is no longer possible. No more spam and mass mailing viruses. You don't need spam filters or service subscriptions any more. COMING SOON. GPL Web

Monodevelop C# IDE that runs on OS X and Linux. GPL Programming

XAMPP Apache, MySQL, PHP web development environment install. Takes care of most configs and setup issues so you don't have to. Also see MAMP, which maybe a bit more stable at this point. APL Server

MegaPOV MegaPOV is a custom unofficial version of POV-Ray with a lot of additional features. GPL 3D Graphics

BRL-CAD The BRL-CAD package is a powerful Constructive Solid Geometry (CSG) solid modeling system with over 20 years development and production use by the U.S. military. Visit the project page for downloads. LGPL 3D Graphics

Frostwire Peer2Peer and BitTorrent client. GPL Peer2Peer

Desktop Manager Multiple desktops (virtual desktops) on OS X. OS X Leopard will havea built in desktop manager. GPL Utility

Aqsis Renderman (as in Pixar) rendering engine, used in 3D apps like K-3D. GPL 3D Graphics

XMM MeD's Movie Manager is a simple to use, yet customizable, movie manager. Info is automatically retrieved from IMDb and tv.com. Technical info can also be retrieved from media files like AVI, OGM, MPEG and DVD (ifo). It's written in Java and should therefore run on most desktop systems supporting Java. GPL Video

Skim Really cool PDF reader with amazing features. Read and annotate scientific papers in PDF. Stop printing and start skimming. BSD Utility

Lazarus Delphi/Kylix like programming environment using Pascal, compiles to exe, gui designer. GPL Programming

ITerm Terminal emulation program written for OS X using Cocoa. Features include tabs, bookmarks, anti-idle,complete VT100 emulation, with additional support for most common xterm and ANSI escape sequences. GPL Utility

Macgpg File, email encryption and other encryption utilites, like a file shredder. GPL Security

Password Gorilla Password manager. GPL Security

QT GUI designer used on multiple platforms, highly used in open source projects. IMPORTANT: QT can be used for free for open source projects only! For commercial projects you must pay to distribute your QT based application. Freeware/other Programming

AOLServer Web server created by AOL. MPL Server

Aria Maestosa Really nice midi tracker/editor. It lets you compose, edit and play midi files with a few clicks in a user-friendly interface offering keyboard, guitar, drum and controller views. GPL Audio

MPEG Streamclip Video converter/editor. May require a purchase of MPEG-2 addon for Quicktime on some Macs. Freeware Video

Smultron Smultron is a free text editor for Mac OS X 10.4 Tiger which is both easy to use and powerful. APL Text/Programming

Kju Run Windows, Linux and a lot more Systems on your Mac. Q is a feature packed cocoa port of QEMU. CC/NC Virtualization

Groovy Groovy is an agile, dynamic programming language for the Java Virtual Machine. Groovy includes features found in Python, Ruby, and Smalltalk, but uses syntax similar to the Java programming language. APL Programming

MacGPG Mac GNU Privacy Guard (Mac GPG for short) is, after a fashion, the Mac OS X port of GnuPG, licensed under the GNU GPL. The aims of the project are to make GnuPG easy to install, develop a framework to make it easy for other developers to incorporate GnuPG functionality into their applications, write services to allow for the use of GnuPG functions in most Cocoa applications, and write a Mac GPG Keys type application so that you no longer have to go to the commandline to manage your keys. For those who don't know, GnuPG is a free OpenPGP client (PGP == Pretty Good Privacy). GPL Security

Borkpad BorkPad is a faithful replica (within reason) of the classic Mac OS 9 NotePad, originally developed by Light Software. It stores multiple pages of plain text notes. It is designed to be fast launching and unobtrusive. Freeware/Other Text/Utility

Sequel-pro Manage MySQL databases (locally or over the internet). It lets you add and remove databases and tables, change fields and indexes, view and filter the content of tables, add, edit and remove rows, perform custom queries and dump tables or entire databases plus more. GPL Utility

Cosmos3d 3-D Mandelbrot Fractal generator. GPL 3D Graphics

Bean Text/HTML editor. Bean is lean, fast, and uncluttered. If you get depressed at the thought of firing up MS Word or OpenOffice, try Bean. If you use Text Edit but have to jump through hoops just to get a word count or change the margins, try Bean. If you're pining away for Write Now-esque simplicity or just want a low-pressure writing environment, try Bean. GPL Office

Spket IDE for JavaScript, XUL/XBL and Yahoo! Widget development. It provides features like code completion, syntax highlighting and content outline that helps developers productively create efficient JavaScript code. Supports Laszlo and Silverlight. Requires Java. Freeware/Other Programming

Songbird Desktop Web player, digital jukebox and Web browser mash-up. Like Winamp, it supports extensions and skins feathers. Like Firefox®, it is built from Mozilla®, cross-platform and open source. Reminds me a bit of Amarok. Also runs on Windows and Linux. Very nice player indeed! MPL/Other Audio

FFmpegX ffmpegX is a Mac OS X graphic user interface designed to easily operate more than 20 powerful Unix open-source video and audio processing tools including ffmpeg the "hyper fast video and audio encoder. Convert, read, encode, and author video. GPL Video

Komodo Edit Free, feature-rich editor for JavaScript, Perl, PHP, Python, Ruby and Tcl, on Linux, Mac OS X and Windows. Freeware Programming

Macstumbler MacStumbler is a utility to display information about nearby 802.11b and 802.11g wireless access points. It is mainly designed to be a tool to help find access points while traveling, or to diagnose wireless network problems. Additionally, MacStumbler can be used for "wardriving", which involves co-ordinating with a GPS unit while traveling around to help produce a map of all access points in a given area. Freeware Utility

IPhoney Looking for a way to see how your web creations will look on iPhone? Look no further. iPhoney gives you a pixel-accurate web browsing environment—powered by Safari—that you can use when developing web sites for iPhone. It's the perfect 320 by 480-pixel canvas for your iPhone development. And it's free. Freeware Programming

VeohTV VeohTV is a free specialized video browser that turns online video into Internet Television. Watch video from thousands of web sites, in one easy-to-use full screen application. Watch streaming video from major television networks such as Fox and CBS, to independently-produced content available on sites such as YouTube, Google Video, Veoh.com and MySpace. Freeware Video

Joost What's Joost? It's video – more than 15,000 shows, with more added daily. It's online – all you need is a broadband internet connection. And it's free. Between this and VeohTV I hardly turn on the television anymore. Freeware Video

StopMojo StopMojo is cross-platform stop-motion animation suite designed to aid in the creation of stop-motion animations. Currently it includes a capture program supporting capture of image files from various video capture devices, overlay of previous frames (onion skinning), and export to AVI and QUICKTIME video formats. GPL Video

Floola Floola is a freeware application to efficiently manage your iPod or your Motorola mobile phone (any model supporting iTunes). Floola supports all common used iPod features including artwork, podcasts and smart playlists! It's also able to convert audio or video incompatible with the iPod so that you can copy almost any file to it. It even allows adding youtube and myspace videos just entering the page url! Freeware Utility

Yamipod YamiPod is a freeware application to efficiently manage your iPod under Mac OS X, Windows and Linux. It can be run directly from your iPod and needs no installation. Take a look at the feature list to find out what it can do and feel free to suggest anything that might be missing. Freeware Utility

Freyja Freyja 3d is a modeler and animator focusing on low polygon game content with wide range of model import/export plugins. Freyja has some unique features such as Lua macros, tools for reverse engineering, and use of GLSL shaders while editing. GPL 3D Graphics

VirtualBox VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software. Intel Macs only unfortunately. Freeware/Other Virtualization

GNUMail GNUMail is a fully featured mail application running on Linux (or FreeBSD, OpenBSD, etc) and Apple Mac OS X. It uses the GNUstep development framework or Apple Cocoa, which is based on the OpenStep specification provided by NeXT, Inc.. GNUMail is licensed under the GPL, and the full sources of the application are available. GPL Web

Macports The MacPorts Project is an open-source community initiative to design an easy-to-use system for compiling, installing, and upgrading either command-line, X11 or Aqua based open-source software on the Mac OS X operating system. Also see Fink. BSD Utility

HomeBank HomeBank is free software. Use it to manage your personal accounts. It is designed to easy to use. Analyse your finances in detail using powerful filtering tools and graphs. Requires X11 GPL Finance

Tomato Torrent BitTorrent promotes the accessibility of data on the Internet by allowing anyone to share information with a large audience. For more information, take a look at the pretty images over at BitTorrent.com. BSD/Other Peer2Peer

Zipeg Zipeg allows you to open and explore content of zip, rar and other archives, preview files and images before you extract/unzip them. Extract only the files you want. Zip thru photo archives. See image thumbnails. Zipeg allows you to decide what do you want to extract. You can choose what to extract and where to put extracted files or just drag and drop them. Freeware/Other Utility

Netbeans IDE with the following features and language support Ajax | C/C++ | Databases | Debugger | Desktop | Editor | GUI Builder | Java EE | Java ME | Java SE | Javascript | Mobile | Profiler | Refactor | REST | Rich Client Platform | Ruby | SOA | SOAP | UML | Web | WSDL | XML. GPLv2/CDDL Programming

NetNewsWire RSS Feed reader. Get your news and information instantly. Customize the way you read and organize feeds. Feeds are stored on NewsGator. I highly recommend this and NewsGator. Freeware Web

Traverso Cross platform multitrack audio recording and editing suite, with an innovative and easy to master User Interface. It's suited for both the professional and home user, who needs a robust and solid DAW. GPL Audio

Hotspot Shield Hotspot Shield creates a virtual private network (VPN) between your laptop and the wireless router. This impenetrable tunnel prevents snoopers and hackers from viewing your email, instant messages, credit card information or anything else you send over a wireless network. Which means you remain anonymous and protect your privacy. Freeware Security

Truecrypt Open-source disk encryption software for Windows Vista/XP , Mac OS X, and Linux. TrueCrypt is a software system for establishing and maintaining an on-the-fly-encrypted volume (data storage device). On-the-fly encryption means that data are automatically encrypted or decrypted right before they are loaded or saved, without any user intervention. No data stored on an encrypted volume can be read (decrypted) without using the correct password/keyfile(s) or correct encryption keys. Entire file system is encrypted (e.g.., file names, folder names, contents of every file, free space, meta data, etc). GPL Security

Pencil Pencil is an animation/drawing software that lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics. Pencil is free and open source. GPL 2D Graphics

The Unarchiver Unzip about anything and everything. I consider this the best open source replacement for Stuffit Expander. GPL Utility

Cord Windows Remote Desktop (terminal services) client. GPL Utility

Code:Blocks The IDE with all the features you need, having a consistent look, feel and operation across platforms. GPL Programming

XBMC XBMC media center is a free cross-platform media-player jukebox and entertainment hub. GPL Multimedia

Lilypond Music notation for everyone. GPL Audio

Musescore Music notation with midi support and plugins. Highly recommended. GPL Audio

ReBirth RB-338 Software simulation of the classic Roland devices TB-303 bassline, TR-808/909 rythym composers (Mac OS9 only). iPhone version here (not freeware) Freeware Audio

Buddi Financial and banking app. GPL Finance

Tor Tor is free software and an open network that helps you defend against a form of network surveillance that threatens personal freedom and privacy, confidential business activities and relationships, and state security known as traffic analysis. BSD Security

Freemind FreeMind is a premier free mind-mapping software written in Java. GPL Utility

Kapling simple little standalone physical modeling synthesizer. GPL Audio

Meteo Meteorologist is a free weather program for Mac OS X. MIT Utility

Qumana Blog editor supporting most blogs. Freeware Utility

Clipmenu Clipboard utility and history. Freeware Utility

MacTube Watch and download videos, YouTube, etc. Freeware Video

Anxiety Lightweight ToDo list. Utilizes the calender/Mail app. Very nice… Freeware Utility

xPad xPad is the ultimate notepad, TextEdit and Stickies replacement for Apple's OS X. Freeware Utility

SketchBox SketchBox is a new – multifunctional yet uncluttered – Sticky Notes Manager for your Mac Desktop. Freeware Utility

Winebottler Wine + a really nice interface to Wine. GPL Utility

SQLiteBrowser SQLite browser and utility. Public Domain Utility

Boxer Kick ass easy interface to DosBox. GPL Utility

Drawberry Very lightweight Vector graphics editor. For more power see Inkscape. GPL 2D Graphics

Lyx LyX is a document processor that encourages an approach to writing based on the structure of your documents (WYSIWYM) and not simply their appearance (WYSIWYG). LyX combines the power and flexibility of TeX/LaTeX. GPL Office

AppTrap With AppTrap, when you move an application to the trash, you're automatically asked if you want to move the associated preference files as well. Now that's uninstallation, the Mac way. GPL Utility

Task Coach Nice Task/ToDo tool created in Python. Also has a commercial iPhone app. GPL Utility

Calibre EBook manager, converter. Syncs with Stanza. GPL Utility

Wireshark Wireshark is the world's foremost network protocol analyzer, and is the de facto (and often de jure) standard across many industries and educational institutions. GPL Network

Nessus The Nessus® vulnerability scanner is the world-leader in active scanners, featuring high-speed discovery, configuration auditing, asset profiling, sensitive data discovery and vulnerability analysis of your security posture. GPL Security

OpenVPN VPN clients. GPL Network

Plex Multimedia home theater, I highly recommend this. GPL Multimedia

Perian Codecs that allow Quicktime to play various unsupported video features. GPL Video

MeasuringCup Cooks recipe manager. Freeware Utility

uApp App uninstaller like iTrash, AppZapper, ect. Discontinued, but still available and works alright. Freeware Utility

Mu.LAB MU.LAB is a hi-quality music application for Mac OSX and Windows, transforming your computer into a complete music studio! Freeware Audio

Wavemaker WaveMaker lets everyone visually & rapidly build great-looking open source web & cloud applications that deploy to a standard Java .war file. APL Programming

NoloPro Quickbooks replacement with Payroll and Quickbooks to Nolo conversion, which isn't free. Software client for Windows and web-based version, which works for OS X, Linux, and Windows using Apache, PHP, etc... Freeware Finance

MacInformer Track, Update, and comment on OS X software installed on your machine. Freeware Utility

AppFresh Track, Update, and comment on OS X software installed on your machine. Interfaces with I Use This. Freeware Utility

MD5App Easily Generate and Verify MD5 Hashes. Freeware Utility

Mumble Mumble is an open source, low-latency, high quality voice chat software primarily intended for use while gaming. BSD Utility

Flock Web browser built off of Firefox geared towards social networking. GPL Web

Hulu Desktop Hulu client. Freeware Video

AppCleaner Really nice uninstaller for the Mac. This should have been included with OS X IMO. Also, while you're there check out the disk encryption app that lets you encrypt your data and an icon switcher. Really good stuff. Freeware Utility

GarageBuy Application that looks the way it should (using the Mac's native interface) to help you find and purchase items on eBay. Freeware Utility

Himmelbar HimmelBar provides an icon in the menu bar to quickly access your installed applications by scanning standard locations such as local, user, network and developer applications. Freeware Utility

Think Lets you put apps and windows in focus quickly. Freeware Utility

Macloc Logout keeping all you apps and data in place. Freeware Utility

Silverskin Have instant access to all of your web server, domain name, and hosting accounts. Serverskine allows you to keep everything straight in a way that's intuitive, easy and useful. Freeware Server

SvnX Subversion client. GPL Programming

Appointments Appointments is an application designed to keep record of customers, contact persons and important events related to them. Information is collected in a structured way: there are separate dictionaries with customers data, contact persons, appointment managers etc. which are used to create appointments record. MIT Utility

FreeDMG FreeDMG can make internet enabled disk images for distribution to Macs as well as ISO/Joliet hybrid images for cross-platform delivery. GPL Utility

Paintbrush Windows Paintbrush clone for OS X. GPL 2D Graphics