www.bfxr.net
Great way to generate sound effects. And it's free, can't beat that.
BFXR is pretty popular (I even stopped using it because every game I play uses it and I got sick of 8-bits sounds :P)
To contribute to the thread, I'll leave this here http://www.reddit.com/r/gamedev/comments/18e38t/pocketknives_for_game_developers/
Develop games in your browser. Powerful, performant & highly capable.
Huh. Thanks, that's very useful.