Simple and light-weight 3D game engine
This software is a particle effect editing tool
Vivid3D is a C++ IDE/3D engine, with python scripting.
Delphi : VRCalc++ OOSL & + (Paged List, TextEditor, VRAstroVision ...)
Free and Open Game Programming Language for Windows and GNU/Linux
Open-source, cross-platform, game-development tools
scriptable game engine with built-in support for 2D graphics and sound