Action-adventure game originally released in 2013
Cross-platform game engine in Rust
Free, cross-platform 2D game engine powered by Haxe and OpenFL
A dead simple 2D game engine for Go
Open source library for creative expression on the web, desktop, etc.
New Godot bindings for Swift
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Portable UCI- and XBoard-compatible chess engines.
Multi-platform 2D and 3D game engine
3D Engine c++
Android, UIQ 3.0, Series 60 Edition 5 open-source software
Use the Delta Executor APK with Roblox on a Windows PC.
A MUD client for Android, iOS, Linux, Mac OS X and Windows
INSTEAD - Simple Text Adventure Interpreter.
GemRB is a portable open-source implementation of the Infinity Engine
GEDKeeper - opensource and crossplatform genealogy management program
Domination is a game that is a bit like the board game Risk
A Dodgeball game made in scratch.
3D modeler, 3D game maker, 3D demo maker
... the open-source glide computer
computer opponent for the board game Blokus
A promising chess program
GLScene Engine for Delphi & C++Builder VCL Windows 32/64
Cross-platform 2D game engine (+ full OpenGL, +full OpenGL ES )