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Iirc Omnisharp comes from the Mono/Xamarin-team and is used as the backing technology behind Monodevelop/Xamarin Studio.

This blog post (scroll down to "Microsoft & OSS") details how the project came to be. http://blog.jonathanchannon.com/2014/11/12/csharp-first-clas...

Hi! tldr; It was completely an OSS project to start with and MS wanted to get on-board which was great.