Application License Type Package link (if available)

brickman ui GPL2 Simple retro-themed touch UI written in vala

KDE Marble (maps) [1] LGPL Touch-optimised mobile application. X11 and Wayland support.

LLs Video Player GPL2 Touch-based Qt Wayland application. Ported to Plasma Mobile.

KCalc GPL2 Qt-based application. Made for desktop but also suitable for touchscreen use.

Kaidan GPL3 Kirigami-based (QT) XMPP application

Gajim GPL3 An XMPP client written in Python with Gtk+3.0 manual installation

Dino GPL3 Modern Jabber/XMPP Client using GTK+/Vala https://dino.im/ WIP by marmistrz

Calligra Gemini[2] GPL2 Word processor and presentation application designed for touchscreen devices. Part of the KDE Calligra suite.

Maya (calendar) GPL3 GTK3 based calendar application from Elementary OS. Supports the CalDAV sync protocol.

Resizes well to a phone's aspect ratio although a few dialog boxes may not be accessible easily.

Photos LGPL2.1 Photo gallery and editor for Elementary OS. Originally a fork of Shotwell.

Resizes well to a phone's aspect ratio although a few dialog boxes may not be accessible easily.

Thunar (file manager) GPL2 Default file manager on XFCE (GTK2-based). Reasonably touch friendly when menu bar and status bar are disabled. Alpine repo

Evince (reader) GPL2 GTK3 document viewer (for PDFs and other formats). Supports highlighting and is touch-friendly. Alpine repo

GNOME Weather GPL2 GTK3-based simple weather application. Touch-friendly. Alpine repo

GNOME Maps GPL2 GTK3-based simple maps application with routing. Reasonably touch-friendly. Alpine repo

GNOME Cheese GPL2 Photobooth-style camera app. "Fullscreen mode" is touch-friendly.

GNOME Photos GPL3 Photo gallery application. Reasonably touch-friendly.

Transmission GPL2/GPL3 BitTorrent client. Main interface is touch friendly but settings is not. Alpine repo

Tuxemon GPL2 Monster fighting RPG. Capture and battle monsters against others! (more games)

Liri Browser GPL3 QtWebEngine-based browser built with complete touch (including smartphone) support, Material Design, and support for coloured-site windows Flatpak

Liri Text GPL3 Simple Qt5 text and code editor using Material Design, with touch support Flatpak

Liri Calculator GPL3 Simple Qt5 calculator using Material Design, with touch support Flatpak

Peruse LGPL2 Comic book reader with touch support, for plasma mobile (in development) #926

Dillo GPL3 Extremely lightweight web browser, using very little RAM. Not touch-optimised but can display most mobile websites well (no HTML5 support), and hence may be the only usable browser on older devices. Uses ~20MB RAM. Alpine repo

Midori LGPL2.1 Fairly lightweight web browser, using very little RAM. Touch-capable but not touch-optimised and not hardware-accelerated. It can display websites well, with HTML5 support. Uses ~40MB RAM. Alpine repo

QtWebBrowser GPL3 Lightweight and touch-friendly web browser based on qt (source [3]).

Ubports Morph browser GPL3 Morph browser (previously known as webbrowser-app) is a lightweight touch-friendly web browser tailored for Ubuntu, based on the Oxide web engine.

Gnome web (epiphany) GPL3 The web browser for the GNOME desktop. Purism is working on making it phone-friendly for their Librem 5 phone.

MoNav GPL3 Lightweight touchscreen Qt-based map application (using OSM). Includes routing.

Navit GPL2, LGPL Open source GTK+ and SDL based car navigation software. Uses OSM, Garmin and other map sources.

Ekiga GPL2 VoIP and video conferencing application for GNOME

GNU Ring GPL3 Peer-to-peer messaging client and protocol. No registration required.

Modest Mail BSD and LGPL Lightweight, touch-friendly email client designed for Nokia Maemo devices. (Not updated since 2010. Their source link is broken, but the code can be found here.)

links2 GPL2 Simple web browser for saving on data consumption. Can be resized to a phone's aspect ratio when running in graphical mode. Alpine repo

Index FM GPL2 Touchscreen file manager for Plasma Mobile