DragonRuby
DragonRuby creates toolchains that allow developers the ability to build apps and games using a programming language called Ruby. The managing members of DragonRuby are Ryan C. Gordon (core contributor of SDL), Amir Rajan (critically acclaimed indie game dev), Aaron Lasseigne (author, presenter, and a powerhouse Ruby developer), and Alex Denisov (LLVM specialist).
An intuitive 2D game engine. Fast as hell, cross-platform, tiny, hot loaded, and royalty free.