Radium Audio has updated Radium to v3.0.2 for Linux, Mac OS X (beta), and Windows.

Radium is a music editor with a new type of interface. It's inspired by trackers, but uses graphics to show musical data.

Some of the features:

Velocity automation.

Effect automation.

Pitch automation.

Tempo automation.

Smooth scrolling.

MIDI sequencing.

Tickless.

Modular mixer.

LADSPA and VST plugins (More than 100 LADSPA plugins are included in the OS X and Windows version).

Several built-in effects and instruments (virtual instruments, etc.).

Pure Data embedded. (Linux only for now).

Zooming.

Microtonality.

Extension language support.

Scores can be generated with Common Music Notation (CMN).

Open source.

Changes between 3.0.0 and 3.0.2:

Ctrl+J jumps to bar/beat instead of line.

Option to record MIDI line by line and monophonic. (traditional tracker MIDI recording).

Fix realtime color update in the editor when using the color config dialog.

Some work-around to make buggy plugins work.

Windows: Enable left win key again when radium is not active, and update the Jack instructions. ("Delay time" value might need to be increased for Jack to start).

Less unnecessary warning messages.

Price: Minimum 2 EUR per month for the full version.

https://www.youtube.com/watch?v=ZMPSd1W1AbE