Roslyn is an open-source developer tools & cli tool — .NET compiler for C# and Visual Basic with rich code analysis APIs. It is written in C#.

Is Roslyn free and open source?

Yes. Roslyn is free and open source, released under the MIT license. You can view and contribute to the source at https://github.com/dotnet/roslyn.

What language is Roslyn written in?

Roslyn is primarily written in C#.

Other open-source developer tools & cli tools on OSSDrop include VS Code, Oh My Zsh, MarkItDown, Go.

Curated

.NET compiler for C# and Visual Basic with rich code analysis APIs.

Developer Tools & CLI·MIT·C#·20.6k stars·v4.0.1·added 2026-09-02

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[![Roslyn on OSSDrop](https://ossdrop.com/badge/roslyn)](https://ossdrop.com/tool/roslyn)

What is Roslyn?
Roslyn is an open-source developer tools & cli tool — .NET compiler for C# and Visual Basic with rich code analysis APIs. It is written in C#.
Is Roslyn free and open source?
Yes. Roslyn is free and open source, released under the MIT license. You can view and contribute to the source at https://github.com/dotnet/roslyn.
What language is Roslyn written in?
Roslyn is primarily written in C#.
What are open-source alternatives to Roslyn?
Other open-source developer tools & cli tools on OSSDrop include VS Code, Oh My Zsh, MarkItDown, Go.

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