Previous Music Production Setup

Master Tracks Pro: https://en.wikipedia.org/wiki/Master_Tracks_Pro

Kawai K4 synthesizer: http://www.polynominal.com/site/studio/gear/synth/kawai-k4/kawai-k4.html

Apple GarageBand: https://en.wikipedia.org/wiki/GarageBand

Current Music Production Setup

Qtractor: https://en.wikipedia.org/wiki/Qtractor

JACK: https://en.wikipedia.org/wiki/JACK_Audio_Connection_Kit

QJackCtl: https://en.wikipedia.org/wiki/Qjackctl

Hydrogen Drum Machine: https://en.wikipedia.org/wiki/Hydrogen_(software)

Yoshimi: https://en.wikipedia.org/wiki/Yoshimi_(synthesizer)

Amsynth: https://en.wikipedia.org/wiki/Amsynth

Fluidsynth: https://en.wikipedia.org/wiki/FluidSynth

WhySynth: http://linuxsynths.com/WhySynthBanksDemos/whysynth.html

QMidiArp: http://qmidiarp.sourceforge.net/

Hexter: http://linuxsynths.com/HexterPatchesDemos/hexter.html

Calf Plugins: https://en.wikipedia.org/wiki/Calf_Studio_Gear

Audacity: https://en.wikipedia.org/wiki/Audacity_(audio_editor)

Notable Mentions

LMMS: https://en.wikipedia.org/wiki/LMMS

Linux-oriented Links

Debian Ports page: https://www.ports.debian.org

Debian Ports PowerPC64: https://wiki.debian.org/PPC64

Fedora: https://getfedora.org