s&box is a modern game engine, built on Valve's Source 2
Gideros Release version
FlightGear Flight Simulator: free open-source multiplatform flight sim
An open-source Phantasy Star Online server for *nix
A fun realistic multiplayer free-and-open-source first-person-shooter!
A network server for the flightgear simulator
Major League Baseball Simulation
SRCP system daemon
MUD server, based on CircleMUD code, russificated
2D Open Source MMORPG
DIS(IEEE 1278.1) Fully Implemented in C++
An ASI plugin for Grand Theft Auto V
turn-based wargame/simulator
Pioneers - The Settlers of Catan
Fractal planet and terrain generator
Open-DIS implements the IEEE DIS protocol in multiple languages.
icsdrone is an interface between a chess server and a chess engine
Unity3D DIS(1278.1) Implementation
Design and Display Happy Cube solutions