Godot Engine – Multi-platform 2D and 3D game engine
A retro game engine for Python
Minetest is an open source voxel game engine with easy modding and game creation
Cross-platform 2D and 3D game engine.
Open-source, cross-platform, C++ game engine for creating 2D/3D games.
A fast, scalable, distributed game server engine/framework for C++, include the actor library, network library, can be used as a real time multiplayer game engine...
An open source version of a game engine developed by Croteam for the classic Serious Sam games.
A lightweight game engine written in modern C++
Powerful, mature open-source cross-platform game engine for Python and C++, developed by Disney and CMU...
:video_game: GDevelop is an open-source, cross-platform game engine designed to be used by everyone.
C++ game engine focusing on modern rendering techniques and performance.
Open-source engine for Heroes of Might and Magic III
3D C++ Game Engine - yet another open source game engine
Modern reimplementation of the Diablo 1 game engine
A powerful free cross-platform RTS game engine
Third-person Survival Game for Unreal Engine 4 (Sample Project)
The official distribution of olcPixelGameEngine, a tool used in javidx9's YouTube videos and projects...
MIT Licensed Open Source version of Torque 2D game engine from GarageGames
KlayGE is a cross-platform open source game engine with plugin-based architecture.
Improved 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....
the thin c++ game engine
Amazon Lumberyard is a free AAA game engine deeply integrated with AWS and Twitch – with full source....
Solar2D Game Engine main repository (ex Corona SDK)
An open-source Tomb Raider 1-5 engine remake
Intrinsic is a Vulkan based cross-platform game and rendering engine. The project is currently in an early stage of development....
Cross-Platform High Performance 2D/3D game engine for people like me who like to write code.
A reimplementation of BioWare's Aurora engine (and derivatives). Pre-pre-alpha :P
Rich HTML UI engine for UE4
Flax Engine – multi-platform 3D game engine
Third-person Action Roguelike made in Unreal Engine C++ (for Stanford CS193U 2020)
Defold is a completely free to use game engine for development of desktop, mobile and web games.