Entitas is a super fast Entity Component System (ECS) Framework
Urho3D Game engine
A cross-platform, open-source, pure C game engine for mobile game
Mini game engine for games104
Engo is an open-source 2D game engine written in Go
Retro game engine for creating games like it's 1997
A fork of dhewm3 with an emphasis on modernisation and vanilla Doom 3
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Go 3D Game Engine
3D C++ Game Engine - yet another open source game engine
QQ Group:538722494,KSFramework = KEngine + SLua(or xLua)
Improved version of the X-Ray Engine, the game engine
RPG dice roll simulator for vintage Tandy TRS-80 100/102/200 laptops
Data-oriented and data-driven game engine written in Rust
A 2D game engine and level editor
KlayGE is a cross-platform open source game engine
Android OpenGL Game Engine
A cross-platform 2D game engine
Clojure in Unity
Planimeter Game Engine 2D - LÖVE-based game engine for Lua
Web powered cross-platform 3D, WebXR game engine