The swiss army knife of lossless video/audio editing
User interface to the Verovio JavaScript Toolkit Library
Nice gui desktop application for tagging your mp3s
Free and Open Source Brainwave Entrainment application
Browser-based online video editor and encoding API
A Linux web based editor librarian for the Akai S3200 sampler.
Very Powerfull Crossplatform Qt Based Music Note Editor[Still Planing]