RetroArch is a frontend for emulators, game engines and media players.
All Google Snake mods combined into one
Fast, user-friendly cross-platform custom launcher for Minecraft
Make Minecraft Java Edition mods, Minecraft Bedrock Edition Add-Ons
JavaScript-based game engine designed to empower developers
Fully async, multithreaded, predictive, open source, 3.01 reach
A Balatro Modding Framework
A 2D rigid body physics engine for the web
Zig game engine & graphics toolkit
Inspecting and manipulating NBT as a file system
xBRZ: "Scale by rules" - high quality image upscaling filter by Zenju
FlightGear Flight Simulator: free open-source multiplatform flight sim
Emulator of the 8-bit computers Sharp MZ-800 / MZ-700 / MZ-1500
A planetarium software that shows a 3D simulation of the night sky
WW2 U-boat simulation
Arianne is an engine to develop multiplayer online games like Stendhal
Colonize the New World.
GemRB is a portable open-source implementation of the Infinity Engine
Online War system for IL-2 Sturmovik and Iron Front in ArmA 2
A fun realistic multiplayer free-and-open-source first-person-shooter!
An open-source Phantasy Star Online server for *nix