Puredyne : Puredyne is the USB-bootable GNU/Linux operating system for creative multimedia.
regex101 : Free PCRE-based regular expression debugger with real time explanation, error detection and highlighting.
Cecilia : Cecilia is an audio signal processing environment aimed at sound designers. Cecilia mangles sound in ways unheard of. Cecilia lets you create your own...
The Joel Test : I've come up with my own, highly irresponsible, sloppy test to rate the quality of a software team : 12 Steps to Better Code.
sfxr : A tool to quickly generate 8bit/16 bit-soud effects!
VST Plugins Free - Virtual instruments and effects