Simple and light-weight 3D game engine
Phaser is a free and fast 2D game framework for making HTML5 games
A re-implementation of Freelancer
Dedicated Game Server Hosting and Scaling for Multiplayer Games
Framework to facilitate communication in the Unity game engine
Godot game template and component-based framework
Easy to use Python library for creating 2D arcade games
Skript is a Bukkit plugin which allows server admins
3D game engine/framework in C, with Luajit and Python bindings now
RenderDoc is a stand-alone graphics debugging tool
The HTML5 Creation Engine
Ct.js is a desktop game engine that makes learning programming fun
This software is a particle effect editing tool
Orx: Portable Game Engine
Framework for creating human behaviour experiments in Unity
Multi-engine plugin to specify agents with reinforcement learning
CGL (C Game Library) is a multipurpose library
SonarSource Static Analyzer for Java Code Quality and Security
Compiler from Go to JavaScript for running Go code in a browser
Everything you need to build and deploy scalable realtime 3D apps
A Logo-like 3D environment, implemented in Nim
Arianne is an engine to develop multiplayer online games like Stendhal
Pycraft is an open-source, OpenGL based game made in Python
maXbox is a script tool engine, compiler and source lib all in one exe