Fugue - Free and premium stock music for your videos, games, and UI
bfxr - An online chiptune sound generator.
Soundstripe - Unlimited music for video
LabChirp - Create simple sound effects on Windows.
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!
sfxia - Free retro style sound generator for games.