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Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D engine that enables developers and content creators to build AAA games, cinema-quality 3D worlds, and high-fidelity simulations without any fees or commercial obligations.
EASTL stands for Electronic Arts Standard Template Library. It is an extensive and robust implementation that has an emphasis on high performance.
OpenTTD is an open source simulation game based upon Transport Tycoon Deluxe
Mumble is an open-source, low-latency, high quality voice chat software.
Industry-standard navigation-mesh toolset for games
Space exploration, trading, and combat game.
An open source, turn-based strategy game with a high fantasy theme.
OpenMW is an open-source open-world RPG game engine that supports playing Morrowind. Main repo and issue tracker can be found here: https://gitlab.com/OpenMW/openmw/
Written in C++ and using SDL, The Powder Toy is a desktop version of the classic 'falling sand' physics sandbox, it simulates air pressure and velocity as well as heat.
Powerful, mature open-source cross-platform game engine for Python and C++, developed by Disney and CMU
Lightweight and modular C++11 graphics middleware for games and data visualization
SteamOS session compositing window manager
Open-source, cross-platform, C++ game engine for creating 2D/3D games.
A high performance, editable terrain system for Godot 4.
SpartanPort: unofficial PC port of God of War III Remastered (PS4) for Windows and Linux (AppImage). Original x86-64 code runs directly on the CPU with a custom runtime; graphics use shadPS4's Vulkan video core. Launcher, in-game menu, controller icons and up to 240 FPS. Requires your own game dump. No game files included.
Behavior Trees Library in C++. Batteries included.
The official distribution of olcPixelGameEngine, a tool used in javidx9's YouTube videos and projects
Command the forces of The Project in a battle to rebuild the world after mankind has been nearly destroyed by nuclear missiles. A 100% free and open source real-time strategy game for Windows, macOS, Linux, BSD+
A powerful free cross-platform RTS game engine. - Report issues at https://springrts.com/mantis/
Bloodborne (v1.09) running natively on Linux and Windows: the game's x86-64 code runs as is, GPU side translated to Vulkan; FSR 4 / DLSS, co-op (BBSC). Bring your own dump.
3D C++ Game Engine - yet another open source game engine
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. Join OpenXRay! ;)
MIT Licensed Open Source version of Torque 3D from GarageGames
3D Engine with Blender Integration