Grit Game Engine - The Grit Game Engine is an MIT-Licensed Open Source Game Engine that is highly scriptable via Lua.
PureBasic - Fantaisie Software Official WebSite. PureBasic - Feel The Pure Power. PureBasic is a programming language based on established BASIC rules.
libtwo - All-purpose c++ app prototyping library, focused towards live graphical apps and games
FreeBASIC - FreeBASIC is a completely free, open-source, 32-bit BASIC compiler, with syntax similar to...
MOS - Lightweight game engine.
Xojo - Real Software and Real Studio are now Xojo.