I just wanted to thank @srakowski for putting together this jam. I think it's a great idea and I'm looking forward to seeing the entries :)
I'm the original creator of MonoGame.Extended and I just wanted to let everyone know that they are welcome to use any of the code in our repo. It's got a MIT licence on the cover but you can use it however you like. Copy / paste, fork the repo or reference the NuGet packages.
As for me, I'm kinda late to the party but I'd love to create an entry if time permits (and I can think of an idea). I've usually got a lot on my plate.
Alternately, if there's anyone already using MonoGame.Extended in their entry and you need a team mate I might be able to find some time to help out.