Lumixengine3D C++ Game Engine - yet another open source game engine
EngineA basic cross-platform 3D game engine
UntoldengineAn easy to use, Open-Source, 3D game engine for iOS/macOS game development.
AlimerCross-platform game engine.
ChillisourceAn open source, cross-platform game engine designed for indie developers.
DaemonThe Dæmon game engine. With some bits of ioq3 and XreaL.
FlaxapiOld repository with C# Editor and C# API for creating games in Flax Engine
CryengineCRYENGINE is a powerful real-time game development platform created by Crytek.
Dmitrysengine[abandoned] C99 cross-platform 3D game engine with absolute minimum of external dependencies
Xray 16Improved version of the X-Ray Engine, the game engine used in the world-famous S.T.A.L.K.E.R. game series by GSC Game World. Join OpenXRay! ;)
Ode4jJava 3D Physics Engine & Library
FuseeFusee aims at becoming a multiplatform 3D realtime engine with a strong emphasis on content transformation and manipulation. Fusee is written mainly in C# and can be programmed in C#. Fusee builds bridges to make your code run in environments that don't support C#, like Content-Creation-Software, C++, Plug-In-APIs and native HTML5/WebGL Javascript code.
SpaceA 3D Game Engine by creatorlxd.Use DirectX
UrsinaA game engine powered by python and panda3d.
EchoA New Cross-Platform 2D 3D Game Engine
Castle EngineCross-platform (desktop, mobile, console) 3D and 2D game engine supporting many asset formats (glTF, X3D, Spine...) and using modern Object Pascal
EtengineRealtime 3D Game-Engine with a focus on space sim. Written in C++ 14
EzengineAn open source game engine in active development
GlasWebGL in WebAssembly with AssemblyScript
Lua-RayCast3D3D Game Engine using RayCasting algorithm for Lua Player Plus
storm-engineGame engine behind Sea Dogs, Pirates of the Caribbean and Age of Pirates games.
nodesnimThe Nim GUI/2D framework, based on OpenGL and SDL2.
MageMage is a 3D Game Engine, built on top of THREE.js. It features Unity-like scripting, AMMO.js powered physics workers, an Infernojs powered UI and a clean API. Under (very) active development.
Py3ODEPort of PyODE for Python 3
GroundEngineGround Engine is an easy to use Game Engine for 3D Game Development written in C++
Auto3D2D and 3D game engine based on OpenGL OpenGL ES and Vulkan