Desktop/Android/HTML5/iOS Java game development framework
lua dev plugin for unreal engine 4 or 5
Orx: Portable Game Engine
OgreWin3D
TX Library is a tiny graphics library for Win32 written in C++.
A free 3D game engine to create games and realtimes scenes for Windows
Updated emulator of Forgotten Realms: Unlimited Adventures
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
2D Game Engine
A 2D game engine and level editor
A cross platform Lua based game engine
Cross-platform 2D and 3D game engine
Free and Open Game Programming Language for Windows and GNU/Linux
2D ARPG Engine
Open-source, cross-platform, C++ game engine for creating 2D/3D games
2D game engine for traditional platform games
Gaming library
Open Game Bootstrap
evolution for vegastrike SpaceSim/Combat/Trade game
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
A generic 2D engine for any kind of game