A lightweight game server framework implemented with Actor Model
Open source simulation game based on Transport Tycoon Deluxe
lua dev plugin for unreal engine 4 or 5
A game engine with an emphasis on real-time cutting-edge solutions
Descent 3 by Outrage Entertainment
Botcraft is a cross-platform C++ library to create bots
A strategy game with a high fantasy theme
RTS game with the theme of Strategy by Design
FlightGear Flight Simulator: free open-source multiplatform flight sim
A free transportation simulator game
A planetarium software that shows a 3D simulation of the night sky
For exploring cellular automata like Conway's Game of Life.
Chess Database and PGN viewer
Good-looking and addictive OpenSource games
Seven Kingdoms: Ancient Adversaries
Colonize the New World.
4X Space Strategy Game