Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Vivid is a modern C++ 3D engine using OpenGL4+
QQ Group:538722494,KSFramework = KEngine + SLua(or xLua)
DOOM / Heretic / Hexen source port with enhanced graphics and UI
Improved version of the X-Ray Engine, the game engine
2D Game Engine
3D Game engine with editor
KlayGE is a cross-platform open source game engine
A cross-platform 2D game engine
A cross platform Lua based game engine
A fast, scalable, distributed game server engine/framework for C++
Cross-platform 2D and 3D game engine
Low-Level Game Engine for Retro Platforms
Blueshift is a cross-platform 3D game engine implemented in C++
Portable game engine with main focus on point-and-click adventures
Game engine for playing tomb raider 1 - 5 levels.
scriptable game engine with built-in support for 2D graphics and sound
Intrinsic is a Vulkan based cross-platform game and rendering engine
An Adventure Game Engine
C++11 cross-platform game engine using SDL2
Multi-platform game engine similar to old Megaman with a stage editor