Easy-to-use 2D primitives
The 2D XNA Primitives project ported to the modern world.
NuGet package: https://www.nuget.org/packages/MonoGame.Primitives2D/
Sample project: https://github.com/DoogeJ/MonoGame.Primitives2D.Sample
NuGet package fixes
General clean-up and preparations to create a NuGet package:
Differences with the original repository (last updated 2012):
This work is licensed under the zlib license, which is pretty close to saying: do what you want.