A free and open source fantasy computer for making, playing and sharing tiny games

A cross-platform creator for classic role-playing-games (RPGs). It’s main aim is to create games similar to the RPGs of the 80’s and 90’s but with modern features as well as support for single and multi-player experiences.

A dead simple 2D game engine for Go

A custom-made game engine based on the Raylib Framework. The Main focus is being performant and only using draw functions instead of textures. When using Shape Engine everything from Raylib is available as well.

Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games.

FNA is a reimplementation of the Microsoft XNA Game Studio 4.0 Refresh libraries

Prowl is an open-source, MIT-licensed game engine developed in pure C# in latest .NET. It aims to provide a seamless transition for developers familiar with Unity by maintaining a similar API while also following KISS and staying as small and customizable as possible. Ideally, Unity projects can port over with as little resistance as possible.

Redot Engine is an open source fork of Godot with the goal of fulfilling the promise of Godot.

Ceramic is a cross-platform framework that lets you create 2D apps and games written in the Haxe programming language. It can export your app natively to Windows, Mac, Linux, iOS, Android, HTML5/WebGL and even Unity projects!

Volta is a WIP 2D game development framework for Luau written in C++. It is cross platform, currently only officially supports Windows, Linux and macOS (though macOS has no official builds, so you will have to compile the framework yourself for it). Android and iOS support is planned in the future.

A free and open-source, cross-platform game engine for creating 2D and 3D projects with Lua or C++. It is lightweight and promotes the simplest way to use the best performance of a data-oriented design.

An open-source SDK for Nintendo 64. It aims for a complete N64 programming experience while providing programmers with modern approach to programming and debugging.

A game development tool that allows anyone to enjoy creating RPGs with intuitive operation and advanced features without programming

Cross platform 2D games based on the Qt framework.

2D game engine made on top of Flutter

2D/3D content creation tool integrating a flexible and visual editor system

3D game engine with lua scripting

An open-source 3D engine with modern graphics that can be used as a C++ framework for graphics projects, a standalone 3D editor, LUA scripting or just for learning

LWJGL is a low-level Java library that enables cross-platform development

KNI, a fork of Microsoft's XNA Framework, is a simple and powerful .NET framework for creating games for desktop PCs, Mobile devices, Virtual Reality headsets and the Web, using dotnet framework & the C# programming language.

Decker is a multimedia platform for creating and sharing interactive documents and adventure games with sound, images, hypertext, and scripted behavior

Luanti (formerly Minetest) is an open-source, cross-platform voxel engine, inspired by Minecraft. Primarily written in C++, utilising the Irrlicht Engine, and it provides an API for users to make games or mods, for existing games, using LUA.

Orbem Studio is a no-code 2D browser game engine built as a WordPress plugin, with a hosted platform at orbem.studio. It renders entirely on the DOM rather than canvas or WebGL, which means a game is a standard web page rather than a self-contained rendering surface embedded in one.

An open-source, 3D game engine forked from the old Blender Game Engine and deployed with Blender itself

A retro game engine for Python

SHMUP Studio is a game creation system designed to create SHMUP games without coding, it has plenty of features and a full blown editor

Pygame CE (Community Edition) is a free and open-source cross-platform library for the development of multimedia applications like video games using Python.

Ruby2D is a framework to build cross-platform 2D applications, games, and visualizations on Ruby.

Dagor Engine and Tools source code from Gaijin Games.

Taylor is a small, free, and open source game engine designed to be easy to use, cross platform, and to boost developer happiness