Phaser is a free and fast 2D game framework for making HTML5 games
A re-implementation of Freelancer
Framework to facilitate communication in the Unity game engine
An elegant Go board and SGF editor for a more civilized age
Godot game template and component-based framework
Dedicated Game Server Hosting and Scaling for Multiplayer Games
3D game engine/framework in C, with Luajit and Python bindings now
RenderDoc is a stand-alone graphics debugging tool
A list of Game Development resources to make magic happen
Creative cellular automata browser game
This software is a particle effect editing tool
Ct.js is a desktop game engine that makes learning programming fun
The HTML5 Creation Engine
Simple DirectMedia Layer
Easy to use Python library for creating 2D arcade games
Multi-engine plugin to specify agents with reinforcement learning
CGL (C Game Library) is a multipurpose library
Framework for creating human behaviour experiments in Unity
SonarSource Static Analyzer for Java Code Quality and Security
Compiler from Go to JavaScript for running Go code in a browser
Orx: Data-Driven Game Engine
Arianne is an engine to develop multiplayer online games like Stendhal
C++ lightweight cross-platform game engine
maXbox is a script tool engine, compiler and source lib all in one exe
Full featured MUD server with all the trimmings.