1.NixOS / nix
Nix, the purely functional package manager
+1,305 stars
from 16,653 · score 7.17
Trending repositories
Ranked by Attention Score: stars gained over the last 180 complete days
71 repositories by Attention Score · May 7, 2026 – Nov 2, 2026 (UTC)
2.lichess-org / lila
♞ lichess.org: the forever free, adless and open source chess server ♞
+910 stars
from 18,026 · score 6.81
3.roc-lang / roc
A fast, friendly, functional language.
+600 stars
from 5,581 · score 6.40
4.supermacro / neverthrow
Type-Safe Errors for JS & TypeScript
+334 stars
from 7,428 · score 5.81
5.jank-lang / jank
jank is the native Clojure dialect with seamless C++ interop.
+203 stars
from 3,168 · score 5.32
6.hmemcpy / milewski-ctfp-pdf
Bartosz Milewski's 'Category Theory for Programmers' unofficial PDF and LaTeX source
+168 stars
from 11,537 · score 5.13
7.hemanth / functional-programming-jargon
Jargon from the functional programming world in simple terms!
+163 stars
from 18,579 · score 5.10
8.KuroLabs / stegcloak
Hide secrets with invisible characters in plain text securely using passwords 🧙🏻♂️⭐
+158 stars
from 3,774 · score 5.07
9.scala / scala
Scala 2 compiler and standard library. Scala 2 bugs at https://github.com/scala/bug; Scala 3 at https://github.com/scala/scala3
+150 stars
from 14,384 · score 5.02
10.coalton-lang / coalton
Coalton is an efficient, statically typed functional programming language that supercharges Common Lisp.
+148 stars
from 1,638 · score 5.00
11.dry-python / returns
Make your functions return something meaningful, typed, and safe!
+123 stars
from 4,260 · score 4.82
12.DeathKing / Learning-SICP
MIT视频公开课《计算机程序的构造和解释》中文化项目及课程学习资料搜集。
+111 stars
from 11,186 · score 4.72
13.dotnet / fsharp
The F# compiler, F# core library, F# language service, and F# tooling integration for Visual Studio
+101 stars
from 4,247 · score 4.62
14.gcanti / fp-ts
Functional programming in TypeScript
+91 stars
from 11,457 · score 4.52
15.apache / groovy
Apache Groovy: A powerful multi-faceted programming language for the JVM platform
+81 stars
from 5,401 · score 4.41
16.MostlyAdequate / mostly-adequate-guide
Mostly adequate guide to FP (in javascript)
+75 stars
from 23,741 · score 4.33
17.louthy / language-ext
C# pure functional programming framework - come and get declarative!
+71 stars
from 7,012 · score 4.28
18.vkhorikov / CSharpFunctionalExtensions
Functional extensions for C#
+51 stars
from 2,782 · score 3.95
19.getify / Functional-Light-JS
Pragmatic, balanced FP in JavaScript. @FLJSBook on twitter.
+47 stars
from 16,673 · score 3.87
20.evhub / coconut
Simple, elegant, Pythonic functional programming.
+45 stars
from 4,311 · score 3.83
21.ring-lang / ring
A simple, lightweight, flexible, embeddable, portable and multi-paradigm dynamic programming language for developing applications, tools, and domain-specific languages
+45 stars
from 1,425 · score 3.83
22.true-myth / true-myth
Safe and idiomatic TypeScript types to handle null, error, and async code handling: Maybe, Result, and Task types that are really nice.
+40 stars
from 1,329 · score 3.71
23.liuxinyu95 / AlgoXY
Book of Elementary Functional Algorithms and Data structures
+33 stars
from 6,295 · score 3.53
24.tidyverse / purrr
A functional programming toolkit for R
+31 stars
from 1,380 · score 3.47
25.sharkdp / cube-composer
A puzzle game inspired by functional programming
+28 stars
from 2,026 · score 3.37
26.lettier / gifcurry
😎 The open-source, Haskell-built video editor for GIF makers.
+27 stars
from 1,427 · score 3.33
27.cyclejs / cyclejs
A functional and reactive JavaScript framework for predictable code
+26 stars
from 10,201 · score 3.30
28.LuxLang / lux
The Lux Programming Language
+26 stars
from 1,724 · score 3.30
29.luafun / luafun
Lua Fun is a high-performance functional programming library for Lua designed with LuaJIT's trace compiler in mind.
+23 stars
from 2,243 · score 3.18
30.Suor / funcy
A fancy and practical functional tools lib
+22 stars
from 3,484 · score 3.14
31.typelevel / fs2
Compositional, streaming I/O library for Scala
+21 stars
from 2,435 · score 3.09
32.AllThingsSmitty / must-watch-javascript
JavaScript talks you have to see 👀 on functional programming, performance, frameworks, React, debugging, leveling up, and more!
+20 stars
from 7,119 · score 3.04
33.Dobiasd / FunctionalPlus
Functional Programming Library for C++. Write concise and readable C++ code.
+20 stars
from 2,276 · score 3.04
34.typelevel / skunk
A data access library for Scala + Postgres.
+19 stars
from 1,648 · score 3.00
35.typelead / eta
The Eta Programming Language, a dialect of Haskell on the JVM
+18 stars
from 2,621 · score 2.94
36.scalaz / scalaz
Principled Functional Programming in Scala
+17 stars
from 4,653 · score 2.89
37.domn1995 / dunet
C# discriminated union source generator
+16 stars
from 872 · score 2.83
38.selfrefactor / rambda
Typescript focused FP library similar to Remeda and Ramda
+13 stars
from 1,745 · score 2.64
39.gigobyte / purify
Functional programming library for TypeScript - https://gigobyte.github.io/purify/
+12 stars
from 1,595 · score 2.56
40.BooleanCat / go-functional
go-functional is a library of iterators to augment the standard library
+12 stars
from 525 · score 2.56
41.awalterschulze / goderive
Derives and generates mundane golang functions that you do not want to maintain yourself
+10 stars
from 1,256 · score 2.40
42.akabe / ocaml-jupyter
An OCaml kernel for Jupyter (IPython) notebook
+9 stars
from 310 · score 2.30
43.milessabin / shapeless
Generic programming for Scala
+8 stars
from 3,393 · score 2.20
44.imteekay / functional-programming-learning-path
✨ A Learning Path for Functional Programming
+8 stars
from 1,037 · score 2.20
45.ghostdogpr / caliban
Functional GraphQL library for Scala
+8 stars
from 985 · score 2.20
46.marblejs / marble
Marble.js - functional reactive Node.js framework for building server-side applications, based on TypeScript and RxJS.
+7 stars
from 2,139 · score 2.08
47.monix / monix
Asynchronous, Reactive Programming for Scala and Scala.js.
+7 stars
from 1,925 · score 2.08
48.softwaremill / quicklens
Modify deeply nested case class fields
+7 stars
from 845 · score 2.08
49.javadev / underscore-java
java port of Underscore.js
+7 stars
from 544 · score 2.08
50.fosskers / transducers
Transducers: Ergonomic, efficient data processing.
+7 stars
from 154 · score 2.08
51.alibaba / fish-redux
An assembled flutter application framework.
+6 stars
from 7,251 · score 1.95
52.hirrolot / mazeppa
A modern supercompiler for call-by-value functional languages
+6 stars
from 473 · score 1.95
53.wavebitscientific / functional-fortran
Functional programming for modern Fortran
+6 stars
from 433 · score 1.95
54.JunggiKim / java-refined
Refinement and functional value types for Java 8+
+6 stars
from 2 · score 1.95
55.benji6 / virtual-audio-graph
:notes: Library for declaratively manipulating the Web Audio API
+5 stars
from 364 · score 1.79
56.kefirjs / kefir
A Reactive Programming library for JavaScript
+4 stars
from 1,882 · score 1.61
57.witchcrafters / quark
Common combinators for Elixir
+4 stars
from 318 · score 1.61
58.fluture-js / Fluture
🦋 Fantasy Land compliant (monadic) alternative to Promises
+3 stars
from 2,487 · score 1.39
59.ehmicky / wild-wild-path
🤠 Object property paths with wildcards and regexps 🌵
+3 stars
from 724 · score 1.39
60.Dobiasd / articles
thoughts on programming
+2 stars
from 1,582 · score 1.10
61.AOL-archive / cyclops
An advanced, but easy to use, platform for writing functional applications in Java 8.
+2 stars
from 1,322 · score 1.10
62.bow-swift / bow
🏹 Bow is a cross-platform library for Typed Functional Programming in Swift
+2 stars
from 657 · score 1.10
63.derive4j / derive4j
Java 8 annotation processor and framework for deriving algebraic data types constructors, pattern-matching, folds, optics and typeclasses.
+2 stars
from 575 · score 1.10
64.Athari / YaLinqo
Yet Another LINQ to Objects for PHP [Simplified BSD]
+2 stars
from 448 · score 1.10
65.TeaEntityLab / fpGo
Monad, Functional Programming features for Golang
+2 stars
from 353 · score 1.10
66.rjNemo / underscore
🌟 Useful functional programming helpers for Go
+2 stars
from 116 · score 1.10
67.evpl / jkscope
Java scope functions inspired by Kotlin
+2 stars
from 22 · score 1.10
68.izdi / elm-cheat-sheet
An overview of Elm syntax and features
+1 stars
from 947 · score 0.69
69.argonaut-io / argonaut
Purely functional JSON parser and library in scala.
+1 stars
from 543 · score 0.69
70.esimov / gogu
A comprehensive, reusable and efficient concurrent-safe generics utility functions and data structures library.
+1 stars
from 108 · score 0.69
71.lettier / parsing-with-haskell-parser-combinators
🔍 A step-by-step guide to parsing using Haskell parser combinators.
+1 stars
from 93 · score 0.69