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Godot Engine – Multi-platform 2D and 3D game engine
One framework for creating powerful cross-platform games.
A game server framework in Go (golang)
Provides a set of default code that makes getting up and running with an HTML5 canvas game very easy.
ctrµLua: Lua homebrewing for 3DS
Game development framework for Lua
A SDL2 based game framework (being) written in C (stands for Game FraMework... lame, I know XD)
Scarlett Framework repository
LibGDX implementation for inari Firefly engine API
This project is going to be scala open source game engine.
:cyclone: A TypeScript engine + web editor for tile-based games (it's not ready yet)