Microsoft has donated the Mono Project to the developers of Wine, the widely-used compatibility layer for running Windows apps on Unix-like systems. This move ensures continued development and support for Mono, an open-source .NET implementation, as Microsoft focuses on its modern .NET initiatives.
https://alternativeto.net/news/2024/8/microsoft-donates-mono-project-to-wine-developers-ensuring-continued-development/
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Wine has already been maintaining it's own fork of Mono. All the Microsoft has done is abandoned the project and pointed that Wine's fork is now official.