FlatRedBall is described as 'Free and open-source, cross-platform 2D game engine written entirely in C# and based on MonoGame/XNA with additional features on top such as:' and is an app in the development category. There are more than 10 alternatives to FlatRedBall for a variety of platforms, including Windows, Linux, Mac, iPad and Android apps. The best FlatRedBall alternative is MonoGame, which is both free and Open Source. Other great apps like FlatRedBall are Cocos2d-x, Phaser, LibGDX and Duality.
One framework for creating powerful cross-platform games. The spiritual successor to XNA with 1000's of titles shipped across desktop, mobile, and console platforms. MonoGame is a fully managed .NET open source game framework without any black boxes.
cocos2d-x is a cross platform open source free 2D game engine for mobile gamedev, that is fast and stable, easy to learn and use.
Phaser is a fun, free and fast 2D game framework for making HTML5 games for desktop and mobile web browsers, supporting Canvas and WebGL rendering.
Java framework providing unified API for building 2D or 3D games across desktop, mobile, and browser platforms, with hot code swapping, rapid prototyping, modular architecture, integrated physics, input, asset tools, and support for desktop-native debugging.
Duality is a modular 2D game engine / editor combo, written entirely in C# and built on top of an OpenGL backend. It's open source, features an open architecture that invites extensibility and technical ownership, and it embraces C# as a language rather than a scripting...
Oxygine is completely free and open source (MIT license) 2D game engine, available on GitHub. It is written in C++ and runs on MacOSX, iOS, Android, Windows and Linux.
UrhoSharp is a lightweight Game Engine suitable for using with C# and F# to create games and 3D applications. The game engine is available as a portable class library, allowing your game code to be written once and shared across all platforms.
NasNas is a lightweight modular 2D game framework with a focus on pixel art style games. It is entirely written in modern C++17, and doesn't have any dependency other than SFML2. It provides a clean and easy to use API.
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