The dotnet/core repository is a good starting point for .NET Core.

The latest major release is .NET Core 2.1. The latest patch updates are listed in .NET Core release notes

• .NET Core 2.1 SDK

• .NET Core released builds
• .NET Core daily preview builds
• .NET Core daily servicing builds

• Learn about .NET Core
• .NET Core Roadmap
• Learn how about the .NET platform
• .NET Core release notes
• .NET Core Announcements
• .NET Core blog

• File a .NET Core issue
• File an ASP.NET Core issue
• File an issue for other components
• Ask on Stack Overflow
• Contact Microsoft Support

The .NET Core team encourages contributions, both issues and PRs. The first step is finding the .NET Core repository that you want to contribute to.

The .NET Core platform is part of the .NET Foundation.

.NET Core repos typically use either the MIT or Apache 2 licenses for code. Some projects license documentation and other forms of content under Creative Commons Attribution 4.0.

See specific repos to understand the license used.