Desktop/Android/HTML5/iOS Java game development framework
Free game engine for development of desktop, mobile, and web games
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
3D Game engine with editor
Multi-platform 2D and 3D game engine
Flax Engine, multi-platform 3D game engine
3D Procedural Game Engine Using OpenGL
A layer built on top of the Insight Toolkit (ITK)
The open-asset-importer-library repository
Memory Efficient Serialization Library
Open source Cardboard SDK and samples
Doom-based AI research platform for reinforcement learning
A free Chess program for Windows with a large set of features
0 A.D. is a free, open-source, cross-platform real-time strategy game.
3D modeler, 3D game maker, 3D demo maker
inputbox password WIN OSX GTK QT Console VCPKG C# Lua R Fortran Pascal
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
Delphi : VRCalc++ OOSL & + (Paged List, TextEditor, VRAstroVision ...)
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
3D C++ Game Engine - yet another open source game engine
The smallest header-only GUI library(4 KLOC) for all platforms
A 2D game engine and level editor
MAME Android Emulator.
Easy fine console input/output for java