Stars
A 2D path and shape drawing library for MonoGame and XNA.
One framework for creating powerful cross-platform games.
Cross platform GUI framework for desktop and mobile applications in .NET
A simple library for creating state machines in C# code
The best C# command line parser that brings standardized *nix getopt style, for .NET. Includes F# support
A modified version of the Irony project (https://irony.codeplex.com) with .NET Core support
Desktop/Android/HTML5/iOS Java game development framework
2D skeletal animation runtimes for Spine.