Music For Makers - Licensing good music has never been this easy.
bfxr - An online chiptune sound generator.
TunePocket - Download 11,000+ royalty free music tracks and sound FX. Buy once, use forever. New music added daily. Save over 50% compared to most popular similar services. Incredible value!
LabChirp - Create simple sound effects on Windows.
AIVA - The AI composing emotional soundtrack music
sfxia - Free retro style sound generator for games.