Does Microsoft use F# for any of its internal projects?

This page summarizes the projects mentioned and recommended in the original post on /r/fsharp

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  • Fable.Python

    Python bindings for Fable

  • I haven't used it yet but here is the repo: (

  • TensorFlow.NET

    .NET Standard bindings for Google's TensorFlow for developing, training and deploying Machine Learning models in C# and F#.

  • Since most Python ML is just a wrapper around C/C++, there's another approach I've heard of but don't know details of, which is to write a C# or F# wrapper around the C/C++ instead of using the Python wrapper. I'm told that Tensorflow.NET does this ( but I don't have enough experience to comment on how well it interops with Python Tensorflow.

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  • fsharp-companies

    Community curated list of companies that use F#

  • There’s a list of companies that use F# and Microsoft is one of them. Also there are testimonials from Microsoft employees and it looks like it has application in analytical/machine learning scenarios.

  • ConcordExtensibilitySamples

    Visual Studio Debug Engine Extensibility Samples

  • The other thing I sometimes miss is debugger support--you can debug through F# code, but any expressions you evaluate via breakpoints or Watch/Quickwatch have to be in C# instead of F#, which is so awkward that it's almost not worth using the debugger ever. I took a stab once at using Concord to write an F# expression evaluator ( but I couldn't make it work in the time I had--I wound up getting lost in the F# compiler service source code.

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