GZDoom is a feature centric port for all Doom engine games
Lossless Scaling Frame Generation on Linux
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
OptiScaler bridges upscaling/frame gen across GPUs
Descent 3 by Outrage Entertainment
Source code repository of the FreeOrion project
Atmosphère is a work-in-progress customized firmware for the Nintendo
A certain block game
Code for Cicero, an AI agent that plays the game of Diplomacy
A cross-platform PSP emulator
Stream switch games to your PC via USB or network
Recreation of the classic Grand Theft Auto III game executable
Powerful, mature open-source cross-platform game engine for Python
Community effort to maintain and improve Jedi Academy (SP & MP)
Multi-platform 2D and 3D game engine
A lightweight game server framework implemented with Actor Model
Classic 2D side-scrolling platformer game
UZDoom is a feature centric port for all Doom engine games
An efficient graphical Minecraft seed finder and map viewer
3D Game engine with editor
A free/open source client and automation tool for Ragnarok Online
Custom launcher to manage multiple installations of Minecraft at once
Open-source engine for Heroes of Might and Magic III
3D Procedural Game Engine Using OpenGL