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The Mono Project (mono/mono) (‘original mono’) has been an important part of the .NET ecosystem since it was launched in 2001. Microsoft became the steward of the Mono Project when it acquired Xamarin in 2016.

The last major release of the Mono Project was in July 2019, with minor patch releases since that time. The last patch release was February 2024.

We are happy to announce that the WineHQ organization will be taking over as the stewards of the Mono Project upstream at wine-mono / Mono · GitLab (winehq.org). Source code in existing mono/mono and other repos will remain available, although repos may be archived. Binaries will remain available for up to four years.

Microsoft maintains a modern fork of Mono runtime in the dotnet/runtime repo and has been progressively moving workloads to that fork. That work is now complete, and we recommend that active Mono users and maintainers of Mono-based app frameworks migrate to .NET which includes work from this fork.

We want to recognize that the Mono Project was the first .NET implementation on Android, iOS, Linux, and other operating systems. The Mono Project was a trailblazer for the .NET platform across many operating systems. It helped make cross-platform .NET a reality and enabled .NET in many new places and we appreciate the work of those who came before us.

Thank you to all the Mono developers!

Explanation of the differences between all the versions of mono from a Hacker News comment

  • pnutzh4x0rOPAEnglish
    32·
    18 days ago

    I think the WINE project was maintaining a fork of Mono that was used to support running certain Windows applications:

    https://wiki.winehq.org/Mono

    So in addition to translating traditional WIN32 system calls, WINE also supports .NET applications, which a number of Windows programs require.

    • gencha@lemm.ee
      6·
      17 days ago

      To add to that for clarity: With the original Mono, you could run a regular Windows .net application on non-Windows without any additional work (with limitations, as native Windows API calls were unsupported). With the modern dotnet, you can compile new applications from source that will run anywhere