SunVox is a small, fast and powerful modular synthesizer with pattern-based sequencer (tracker).

Buzz is a Digital Audio Workstation with a unique top-down approach to music composition known as a tracker interface.

ZynAddSubFX (Zyn-Fusion) is a free open source software synthesizer.

MuLab is an inspiring music production studio.

Frinika is a free, complete music workstation software.