What happened to SharpDevelop? Why was it discontinued?

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According to dgrunwald , a member of ICSharpCode github icsharpcode/SharpDevelop community:

Yes, it's dead.

It takes a massive amount of effort just to keep up with the changes to the language and build system Microsoft is doing, probably at least 2 man-years to catch up to C# 7 / the .NET Core stuff. That's a bit too much for a hobby project -- we don't have that kind of free time anymore, and even if we did, there are better ways to spend it than playing catch-up with a huge dev team at Microsoft.

Combine that with the free community edition, and there's little space for multiple open-source C# IDEs.

Remember that MonoDevelop is still around; and that VS Code is also open-source! Start with one of those if you need a portable IDE.

https://github.com/icsharpcode/SharpDevelop/issues/799

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Alternative:

https://www.monodevelop.com/

(Cross platform IDE for C#, F# and more)