The All-in-One music game
OpenKore is an automation tool for Ragnarok Online
Godot game template and component-based framework
Odamex is a free, cross-platform, modern client-server Doom engine
An updated version of the classic "Basic Computer Games" book
Air traffic control tower and radar simulator (solo + multi-player)
Provides a full suite of clients and servers for virtual worlds.
Android, UIQ 3.0, Series 60 Edition 5 open-source software
3D game engine/framework in C, with Luajit and Python bindings now
A 2D rigid body physics engine for the web
A lightweight game server framework implemented with Actor Model
Zoomable user interface (ZUI) with file manager, file viewers and more
Java applications to control a model railroad layout.
Amazon Lumberyard is a free AAA game engine