IRB is a game creation toolkit
2D ARPG Engine
A fast, powerful and adaptable GUI solution
A powerful HTML, C#, PHP editor for windows
Extensible vector graphics editor with Latex text support.
A Simple Game Engine
Frameserver plugin for video editing via scripting.
FiatLux is a programmer's text editor written with wxWidgets
Use Tubepad to Writedown Professionally built youtube tutorials
Lua Editor
A complete 2D Game Engine with built in drag and drop editor
MIDI/Sysex editor for Waldorf Microwave II/XT/XTk
Experimental lightweight editor