Bfxr
Used by 6 peoplebfxr.net ↗

“For a lot of our audio we're using a great little tool called Bfxr.”
Dave Lloyd Interview, Game developer (Crawl) · via Uses This 
“Actually, I really love screwing around making sounds with Bfxr; Audacity is just for superbasic editing.”
Chris Klimas Interview, Web developer (Twine) · via Uses This