MLT Multimedia Framework
Polymeter MIDI sequencer
The Java Multitrack Audio Recording Software AudioChain
Multitrack audio editor
Free yourself
OS X Alternative that installs on most new or old computers
mintyMac 64 bit OS with Xfce4, Gnome,and E17
The Complete 64bit Audio and Video Linux Workstation
Mate Desktop with OS X look and feel, System Sounds, MDM, Compiz etc
Simple handling of Jack, multi-track recording and music player
A tool for automated downmixing of live multitrack sound recordings
Multitrack audio file player and mixer for making live sound collage