It's a shame Microsoft slowly let it die instead of straight-up announcing they're discontinuing MonoDevelop/moving to "VS for Mac". That way, maybe a community maintaining the code would have sprung up. Now anyone wanting to revive the project has a lot of work to up front, starting with "what's the last commit that builds?".

There is DotDevelop, a later fork, but doesn't seem too lively or stable. SharpDevelop died too, so maybe the issue is just adapting to the changes made to .NET with .NET Core.