The game engine for everyone
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Open source library for creative expression on the web, desktop, etc.
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
New Godot bindings for Swift
The ioquake3 community effort to continue supporting/developing id's
Stride (formerly Xenko), a free and open-source cross-platform C# game
dhewm 3 main repository
GemRB is a portable open-source implementation of the Infinity Engine
Ze Text Adventure game Builder : Create as you play !
A cell-based puzzle game featuring classic and completely new puzzles
Urho3D Game engine
2D Game Engine
A cross platform Lua based game engine
Multi-platform game engine similar to old Megaman with a stage editor
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
C++ OpenSource Game Fabric based on SDL2