Telegram Bot API for Java
A cross-platform, open-source, pure C game engine for mobile game
Real-time collision detection and multi-physics simulation for VR
An elegant Go board and SGF editor for a more civilized age
Engo is an open-source 2D game engine written in Go
A simulator for drones, cars and more, built on Unreal Engine
Retro game engine for creating games like it's 1997
Open source reimplementation of GTA San Andreas game engine in Unity
FlightGear Flight Simulator: free open-source multiplatform flight sim
A free transportation simulator game
Chess Database and PGN viewer
For exploring cellular automata like Conway's Game of Life.
C64/Amiga emulator with shader and runAhead
A modern, cross-platform Quake game engine based on FitzQuake.
3D Engine c++
A frontend for Mupen64Plus
A cross-platform port of Hexen II game.
Odamex is a free, cross-platform, modern client-server Doom engine
GEDKeeper - opensource and crossplatform genealogy management program
INSTEAD - Simple Text Adventure Interpreter.
3D modeler, 3D game maker, 3D demo maker
Cross-platform, GPL reimplementation of the classic : Syndicate