craftworkgames 

It makes MonoGame more awesome.

An event based input system to MonoGame more awesome.

Content Pipeline importers and processors to make MonoGame more awesome.

Graphics makes MonoGame more awesome.

Support for Tiled maps to make MonoGame more awesome. See http://www.mapeditor.org

A tweening system to make MonoGame more awesome.

Animations to make MonoGame more awesome.

A high performance particle system to make MonoGame more awesome.

An Entity Component System to make MonoGame more awesome.

A GUI system for MonoGame written from the ground up to make MonoGame more awesome.

A scene graph system to make MonoGame more awesome.

A port of the Nuclex GUI system (https://nuclexframework.codeplex.com/) to make MonoGame more awesome.

Collisions to make MonoGame more awesome.

Farseer Physics compiled as a portable class library (PCL) for use with the PCL version of MonoGame.