Xojo - Real Software and Real Studio are now Xojo.
Pygame - Pygame is a set of Python modules designed for writing games.
FreeBASIC - FreeBASIC is a completely free, open-source, 32-bit BASIC compiler, with syntax similar to...
Unigine - Unigine Engine is a proprietary cross-platform middleware, developed by Unigine Corp.
PowerBASIC - PowerBASIC, formerly Turbo Basic, is the brand of several commercial compilers by PowerBASIC Inc.
libtwo - All-purpose c++ app prototyping library, focused towards live graphical apps and games