Top 5 F# Functional programming Projects

VisualFSharp

5 3,647 9.7 F#

The F# compiler, F# core library, F# language service, and F# tooling integration for Visual Studio

Project mention: Experimentation with Optimized Closures | /r/fsharp | 2023-03-31

There's docs about how the compiler generally does optimizations here: https://github.com/dotnet/fsharp/blob/main/docs/optimizations.md
dark

7 1,440 9.9 F#

Darklang main repo, including language, backend, and infra

Project mention: WASM_of_OCaml | news.ycombinator.com | 2023-07-24

Yes. Darklang was originally in OCaml using js_of_ocaml, and we ported it to F# using Blazor (https://github.com/darklang/dark/tree/main/backend/src/Wasm). It works.
We found that in dotnet 6, the code was much slower, with long startup times and a much bigger download, than in js_of_ocaml. It also had a lot of issues in running in a Webworker, which wasn't the case for js_of_ocaml.
In dotnet 7, the webworker issues are better and AOT is easier, so startup is faster. Download sizes are still bad, and it's still slower than js_of_ocaml.
However, dotnet allows almost any code to run in WASM, which js_of_ocaml had large limitations. This meant a decent chunk of functionality had to be worked around to make separate js vs native targets, which also was a massive pain and took a long time. Dune's virtual targets wasn't ready at the time - I think we were one of the test cases for it.
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WebApiTest

0 47 1.8 F#

Sustainable Web API written in F# that showcases the language's strengths via a functional style.
Lambda-Calculus

0 13 0.0 F#

A simple Programming Language Compiler to Lambda-Calculus, with a Lambda-Runtime (by Demuirgos)
Transmute

2 2 0.0 F#

A sound change applier in F#

Project mention: What are you working on? (2023-04) | /r/fsharp | 2023-04-03

Last month I rewrote the transducer module's guts from the ground up. I'm super excited about this because it's really been more of a meditation on language and computation, but now that I've eliminated the most pernicious bugs, it basically works! Try the browser demo. I'm still figuring out how to use web workers with Fable, so if you want to see how fast it can go when it's running on all your cores, try one of the binaries.
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NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2023-07-24.