Bosca Ceoil - A free, easy to use tool for creating music.
Fission - Edit audio in minutes, not hours.
Renoise - Renoise is a digital audio workstation.
Audio Cleaning Lab - Looking to clean up your song recordings? Download SOUND FORGE Audio Cleaning Lab, the professional solution for cleaning & restoration with advanced ProAudio technology.
Zynewave Podium - Podium is a modern digital audio workstation (DAW) for Windows.
LMMS - Make music with a free, cross-platform tool