Enables Roblox developers to use professional software tools
A simple and easy-to-use library to enjoy videogames programming
Open game and rendering engine packed into a JavaScript framework
Open source HTML5 game framework that offers WebGL and Canvas
Desktop/Android/HTML5/iOS Java game development framework
A quick and easy to use drag and drop retro game creator
Open source library for N64 development
You can make it - Open Source MMORPG Platform
Fantasy computer for making, playing and sharing tiny games
Gideros Release version
All-In-One program that combines multiple Fortnite Dev Account tools.
Examples of procedural geometry for Unity3D C#
PyCAPGE - Python Classic Adventure Point and Click Game Engine
SDL based generic 2D game engine
A free 3D game engine to create games and realtimes scenes for Windows
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
A real-time game development platform
Generate ready-to-use disc images for your Sega Dreamcast system!
Asphyre is a cross-platform framework for Delphi and FreePascal.
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Open Game Bootstrap