JetBrains Rider is a popular alternative to Visual Studio that got a lot of traction among .NET developers. Those who use Mac and Linux mostly use Rider when developing for .NET. It is very unfortunate that SonarLint IntelliJ plugin doesn’t include Rider in the list of supported Jetbrains IDEs.
Previously, it was pointed out that the lack or Roslyn analyzers support in Rider prevent this feature to be included in SonarLint, but this blocker is now removed https://groups.google.com/forum/#!topic/sonarlint/pgmvXyVt-6I
Please consider extending SonarLint plugin for JetBrains IDEs to support Rider and C#.