Items starting with S
Scratch
Easily create interactive stories, animations and games.
SonicBirth
SonicBirth is a massive modular construction environment that enables the user to patch together individual modules in order to create their own audio effects, synthesisers and more.
Soundgrain
From the man behind Cecilia and Zyne, Soundgrain taps into the weird and wonderful world of granular processing.
Standard Notes
What to use if you're nervous about entrusting your data to someone else's product roadmap (EverNote or OneNote or Keep).
SuperCollider
Another one for OS X, Windows and Linux, this GNU GPL release has been in active development since 1996.