[SgtBastard]

Yes:

https://learn.microsoft.com/en-us/dotnet/core/install/linux

Also VS Code, an open source IDE with first class support for .NET languages:

https://code.visualstudio.com/docs/setup/linux

[all2]

Also emacs has a pretty good csharp language server integration. I personally use the Spacemacs "dotnet" layer.