An open source re-implementation of RollerCoaster Tycoon 2 🎢
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Cataclysm - Dark Days Ahead. A turn-based survival game set in a post-apocalyptic world.
Flexible level editor
OpenTTD is an open source simulation game based upon Transport Tycoon Deluxe
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.
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.
Lightweight and modular C++11 graphics middleware for games and data visualization
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+
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! ;)
SuperTux source code
Widelands is a free, open source real-time strategy game with singleplayer campaigns and a multiplayer mode. The game was inspired by Settlers II™ (© Bluebyte) but has significantly more variety and depth to it.
A retro multiplayer shooter
Community effort to maintain and improve Jedi Academy (SP & MP) + Jedi Outcast (SP only) released by Raven Software
Open-source clone of the original X-Com 👽
Advanced rhythm game for Windows, Linux and OS X. Designed for both home and arcade use.
A game of lonely space adventure
Multi Theft Auto is a game engine that turns Grand Theft Auto: San Andreas into networked multiplayer.
Brood War API
Multiplayer top-down shooter made from scratch in C++. Web version: https://play.hypersomnia.io Made in 🇵🇱
GemRB is a portable open-source implementation of Bioware’s Infinity Engine.
Source code of open-source Colobot: Gold Edition project developed by Epsitec and TerranovaTeam
Compatible client of Ace of Spades 0.75