WaveBots Editor - Procedural music and sound maker that exports to Wav, MIDI, GoatTracker and much more.
Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
Abundant Music - Generate royalty free music with a simple but very powerful procedural music creator
Oceanaudio - Ocenaudio is a cross-platform, easy to use, fast and functional audio editor.
Wotja - WOTJA generates live ambient, adaptive, reflective & generative music, MIDI, text to music melodies, creative writing 'cut-up' & more.
GoldWave - GoldWave. Digital Audio Editing Software. Record • Restore • Convert • Analyze. Fully loaded to do everything from the simplest recording and editing to the most sophisticated audio processing, restoration, enhancements, analysis, and conversions.