Chopper - projectly currently houses both the game and engine may split the engine out
ChopperPipelineExtensions - extend content pipeline to support level design files for Chopper
Engine2DPipelineExtensions - extend content pipeline to support data for Animation. Using Json over XML and built additional JSON Pipeline Extension as well.
GameEditor - basic WinForms Game Editor project made with MonoGame.Forms and MonoGame.Extended
MiniMan 2D Platformer
That's it. Not much to it.
Well known twin-stick shooter XNA/MonoGame tutorial