Wired supports unlimited Audio/Midi tracks playback and recording, and introduces a Plugin system for instruments and effects.

Software tuner for linux.

MusE is a MIDI/Audio sequencer with recording and editing capabilities written by Werner Schweer. MusE aims to be a complete multitrack virtual studio for Linux.

Hydrogen is an advanced drum machine for GNU/Linux. It's main goal is to bring professional yet simple and intuitive pattern-based drum programming.

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. Experiment with new ideas about music and sound. Generate sound installations for 12 speaker gallery shows.

Cool app to analyze log files with.