lua dev plugin for unreal engine 4 or 5
Desktop/Android/HTML5/iOS Java game development framework
Orx: Portable Game Engine
OgreWin3D
Updated emulator of Forgotten Realms: Unlimited Adventures
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
A 2D game engine and level editor
2D ARPG Engine
Open Game Bootstrap
evolution for vegastrike SpaceSim/Combat/Trade game
Mahasona engine is an open source game engine.
Cross-platform C framework very compact libraries and tools.
A generic 2D engine for any kind of game
3D Game engine
C++ Framework for slot machine games
A game development kit for Sifteo Cubes.
cross-platform 2d game engine
Investigo - DX9 Performance and Debugging Toolkit
A cross-platform OpenGL based lightweight scenegraph library
Cross-platform 2D game engine
A cross platform 3d c++ game engine