Scripting platform, modding framework and VR support for RE Engine
Unity / XNA game patcher and plugin framework
Create Minecraft bots with a powerful and high level JavaScript API
A framework to build Pokémon RPG games
Phaser is a free and fast 2D game framework for making HTML5 games
3D game engine/framework in C, with Luajit and Python bindings now
Godot game template and component-based framework
LÖVE is an awesome 2D game framework for Lua
MAME is a multi-purpose emulation framework
A lightweight game server framework implemented with Actor Model
A lightweight online game framework
A fast and reliable entity component system (ECS) and much more
Multiplayer Framework for Node.js
A grid based movement engine compatible with Phaser3
Cross-platform runtime for cloud, mobile, desktop, and IoT apps
Telegram Bot API for Java
UI Automation Framework for Games and Apps
A free (libre) open source, mobile OS for Ethereum
Open source and cross-platform machine learning framework for .NET
2D GPU-accelerated framework for ActionScript developers
An asynchronous event driven PHP socket framework
Access serial ports with JavaScript. Linux, OSX and Windows
A fast entity component system (ECS) for C & C++
SDL library for Android, including several games.