Grief - BRIEF clone
Web IDE in single HTML file
Homebrew save management, editing tool and memory trainer for Horizon
2D Game Engine
Multi-platform game engine similar to old Megaman with a stage editor
PSP Debug Bash and Multi-Environment Shell
MicroLua brings Lua on the Nintendo DS for easy programming
Very Powerfull Crossplatform Qt Based Music Note Editor[Still Planing]
A compiler for creating games on MOS-65xx-based computers