MonoGame
MonoGame is a free and open-source framework that allows developers to create cross-platform games using C# and other .NET languages. It supports multiple platforms, including Windows, macOS, Linux, Android, iOS, PlayStation 4, PlayStation 5, Xbox One, and Nintendo Switch. MonoGame provides a comprehensive set of features, such as 2D and 3D rendering, sound playback, input handling, and content management, enabling the development of high-quality games across various genres. The framework is a re-implementation of Microsoft's XNA 4 API, ensuring familiarity for developers with XNA experience. Notable games developed with MonoGame include "Streets of Rage 4," "Carrion," "Celeste," and "Stardew Valley." MonoGame is actively maintained by the MonoGame Foundation and its community, with ongoing updates and support.
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LÖVE
As you probably know by now, LÖVE is a framework for making 2D games in the Lua programming language. LÖVE is totally free, and can be used in anything from friendly open-source hobby projects, to evil, closed-source commercial ones. To make a minimal game, create a folder anywhere, and open up your favorite text editor. Sublime Text is a pretty good one for all operating systems, and it has Lua support built in. Create a new file in the folder you just created, and name it main.lua. Put the following code in the file, and save it.
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O3DE
Open 3D Engine (O3DE) is a modular, open source, cross-platform 3D engine built to power anything from AAA games to cinema-quality 3D worlds to high-fidelity simulations. No fees or commercial obligations. Apache 2.0-licensed. Managed by The Linux Foundation. O3DE's modular architecture is built for customization from day one. Each component—known as a Gem—can be adopted separately, giving you access to the specific functionality needed for your application. Add new editing tools, features, and development workflows to your projects. Choose from a variety of community-maintained Gems to extend and enhance the engine's capabilities in anything from AI and robotics to push notifications and VR. With our engine's SDK capabilities, you can use O3DE as a foundation for any type of 3D project you can imagine.
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Phaser
Phaser is a fast, free, and fun open source HTML5 game framework that offers WebGL and Canvas rendering across desktop and mobile web browsers. It has been actively developed for over 10 years. Phaser is built on and around web standards and puts the browser first. Web export isn't an afterthought or checkbox on a feature list; it's our home. Phaser is fully open source, and you have unrestricted access to every last line of code in the core library. Phaser has more ready-made templates than any other game framework and is a great CLI tool. Games made with Phaser have been used as the cornerstone for marketing campaigns for years. They've been deployed everywhere, including as prominent features on sites for major Hollywood film blockbusters, massive brand promotional campaigns, educational content, interactive experiences, TV shows, news reports, charity fund-raising broadcasts, live events marketing, and so many more.
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