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Editorial Team
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Editorial Team
Asked: May 17, 20262026-05-17T19:14:32+00:00 2026-05-17T19:14:32+00:00

Which parts of the Visual Studio IDE (if any) are open source? Thanks!

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Which parts of the Visual Studio IDE (if any) are open source? Thanks!

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  1. Editorial Team
    Editorial Team
    2026-05-17T19:14:32+00:00Added an answer on May 17, 2026 at 7:14 pm

    Here are the components in Visual Studio that I am aware of which have some level of source accessibility.

    • MEF
    • Iron Languages
    • DLR
    • F#
    • CLR: subset of the CLR known as Rotor is open source
    • BCL, WinForms an WPF: source is available under the Source Reference License
    • Plugin’s: Many of the Visual Studio employee plugins available on the Visual Studio gallery have source accessibility.

    Note: I intentionally used “some level of source accessibility” instead of “open source”. The term “open source” has a very specific meaning to certain portions of the developer population which does not align with the components I’ve listed here. In particular they deam it to mean source which is contributable by anyone. There is no part of Visual Studio today (that I’m aware of) which has that level of open source about it.

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