There are many repos that make up .NET Core. To file an issue, make a PR, or engage on specific topics, it is best to engage with developers working on the right repo. A largely complete set of .NET Core repositories follows.
- dotnet/cli - .NET Core CLI tools
- dotnet/core-setup - .NET Core Runtime Installers and application model
- dotnet/corefx - .NET Core APIs
- dotnet/coreclr - .NET Core runtime
- dotnet/docs - .NET documentation
- dotnet/sdk - .NET Core SDK (used by Visual Studio and CLI)
- dotnet/dotnet-docker - .NET Core Docker images
- dotnet/wpf - Windows Presentation Foundation
- dotnet/winforms - Windows Forms
- dotnet/standard - .NET Standard definition
- dotnet/roslyn - Roslyn and C#
- dotnet/csharplang - C# spec
- dotnet/vblang - VB spec
- dotnet/netcorecli-fsc - F# integration into .NET CLI
- nuget/home - NuGet client
- aspnet/home - ASP.NET Core framework
- aspnet/Docs - ASP.NET and ASP.NET Core documentation
- dotnet/wcf - WCF
- microsoft/dotnet - catch-all repository for .NET (where most .NET Framework issues are filed)
- microsoft/dotnet-framework-docker - .NET Framework Docker images