Open Source Solid Modeling CAD
Video mixer for mixing live and recorded video and audio feeds
Pencil2D is a cross-platform animation/drawing application.
Converts between many 3D data formats
TV streaming server and digital video recorder for Linux
Play midi files via external midi devices or soft synth.
A free karaoke player for Linux and BSD
Very Powerfull Crossplatform Qt Based Music Note Editor[Still Planing]