1.NixOS / nix
Nix, the purely functional package manager
+591 stars
from 17,367 · score 6.38
Trending repositories
Ranked by Attention Score: stars gained over the last 90 complete days
79 repositories by Attention Score · Aug 5, 2026 – Nov 2, 2026 (UTC)
2.lichess-org / lila
♞ lichess.org: the forever free, adless and open source chess server ♞
+462 stars
from 18,474 · score 6.14
3.roc-lang / roc
A fast, friendly, functional language.
+295 stars
from 5,886 · score 5.69
4.hemanth / functional-programming-jargon
Jargon from the functional programming world in simple terms!
+127 stars
from 18,615 · score 4.85
5.supermacro / neverthrow
Type-Safe Errors for JS & TypeScript
+125 stars
from 7,637 · score 4.84
6.jank-lang / jank
jank is the native Clojure dialect with seamless C++ interop.
+92 stars
from 3,279 · score 4.53
7.KuroLabs / stegcloak
Hide secrets with invisible characters in plain text securely using passwords 🧙🏻♂️⭐
+89 stars
from 3,843 · score 4.50
8.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。
+60 stars
from 11,237 · score 4.11
9.hmemcpy / milewski-ctfp-pdf
Bartosz Milewski's 'Category Theory for Programmers' unofficial PDF and LaTeX source
+59 stars
from 11,646 · score 4.09
10.coalton-lang / coalton
Coalton is an efficient, statically typed functional programming language that supercharges Common Lisp.
+57 stars
from 1,729 · score 4.06
11.dry-python / returns
Make your functions return something meaningful, typed, and safe!
+50 stars
from 4,333 · score 3.93
12.dotnet / fsharp
The F# compiler, F# core library, F# language service, and F# tooling integration for Visual Studio
+49 stars
from 4,299 · score 3.91
13.apache / groovy
Apache Groovy: A powerful multi-faceted programming language for the JVM platform
+47 stars
from 5,435 · score 3.87
14.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
+42 stars
from 14,492 · score 3.76
15.gcanti / fp-ts
Functional programming in TypeScript
+35 stars
from 11,513 · score 3.58
16.MostlyAdequate / mostly-adequate-guide
Mostly adequate guide to FP (in javascript)
+27 stars
from 23,789 · score 3.33
17.getify / Functional-Light-JS
Pragmatic, balanced FP in JavaScript. @FLJSBook on twitter.
+24 stars
from 16,696 · score 3.22
18.louthy / language-ext
C# pure functional programming framework - come and get declarative!
+23 stars
from 7,060 · score 3.18
19.ring-lang / ring
A simple, lightweight, flexible, embeddable, portable and multi-paradigm dynamic programming language for developing applications, tools, and domain-specific languages
+19 stars
from 1,451 · score 3.00
20.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.
+19 stars
from 1,350 · score 3.00
21.liuxinyu95 / AlgoXY
Book of Elementary Functional Algorithms and Data structures
+18 stars
from 6,310 · score 2.94
22.lettier / gifcurry
😎 The open-source, Haskell-built video editor for GIF makers.
+18 stars
from 1,436 · score 2.94
23.evhub / coconut
Simple, elegant, Pythonic functional programming.
+17 stars
from 4,339 · score 2.89
24.AllThingsSmitty / must-watch-javascript
JavaScript talks you have to see 👀 on functional programming, performance, frameworks, React, debugging, leveling up, and more!
+15 stars
from 7,124 · score 2.77
25.vkhorikov / CSharpFunctionalExtensions
Functional extensions for C#
+15 stars
from 2,818 · score 2.77
26.LuxLang / lux
The Lux Programming Language
+14 stars
from 1,736 · score 2.71
27.cyclejs / cyclejs
A functional and reactive JavaScript framework for predictable code
+13 stars
from 10,214 · score 2.64
28.typelevel / fs2
Compositional, streaming I/O library for Scala
+13 stars
from 2,443 · score 2.64
29.sharkdp / cube-composer
A puzzle game inspired by functional programming
+13 stars
from 2,041 · score 2.64
30.tidyverse / purrr
A functional programming toolkit for R
+13 stars
from 1,398 · score 2.64
31.luafun / luafun
Lua Fun is a high-performance functional programming library for Lua designed with LuaJIT's trace compiler in mind.
+12 stars
from 2,254 · score 2.56
32.typelead / eta
The Eta Programming Language, a dialect of Haskell on the JVM
+10 stars
from 2,629 · score 2.40
33.Dobiasd / FunctionalPlus
Functional Programming Library for C++. Write concise and readable C++ code.
+9 stars
from 2,287 · score 2.30
34.Suor / funcy
A fancy and practical functional tools lib
+8 stars
from 3,498 · score 2.20
35.gigobyte / purify
Functional programming library for TypeScript - https://gigobyte.github.io/purify/
+8 stars
from 1,599 · score 2.20
36.domn1995 / dunet
C# discriminated union source generator
+7 stars
from 881 · score 2.08
37.monix / monix
Asynchronous, Reactive Programming for Scala and Scala.js.
+6 stars
from 1,926 · score 1.95
38.selfrefactor / rambda
Typescript focused FP library similar to Remeda and Ramda
+6 stars
from 1,752 · score 1.95
39.awalterschulze / goderive
Derives and generates mundane golang functions that you do not want to maintain yourself
+6 stars
from 1,260 · score 1.95
40.novalagung / gubrak
⚙️ Golang functional utility library with syntactic sugar. It's like lodash, but for Go
+6 stars
from 513 · score 1.95
41.scalaz / scalaz
Principled Functional Programming in Scala
+5 stars
from 4,665 · score 1.79
42.typelevel / skunk
A data access library for Scala + Postgres.
+5 stars
from 1,662 · score 1.79
43.funkia / list
🐆 An immutable list with unmatched performance and a comprehensive functional API.
+4 stars
from 1,647 · score 1.61
44.imteekay / functional-programming-learning-path
✨ A Learning Path for Functional Programming
+4 stars
from 1,041 · score 1.61
45.milessabin / shapeless
Generic programming for Scala
+3 stars
from 3,398 · score 1.39
46.marblejs / marble
Marble.js - functional reactive Node.js framework for building server-side applications, based on TypeScript and RxJS.
+3 stars
from 2,143 · score 1.39
47.javadev / underscore-java
java port of Underscore.js
+3 stars
from 548 · score 1.39
48.BooleanCat / go-functional
go-functional is a library of iterators to augment the standard library
+3 stars
from 534 · score 1.39
49.wavebitscientific / functional-fortran
Functional programming for modern Fortran
+3 stars
from 436 · score 1.39
50.higherkindness / droste
recursion schemes for cats; to iterate is human, to recurse, divine
+3 stars
from 393 · score 1.39
51.TomerAberbach / lfi
🦥 A lazy functional iteration library supporting sync, async, and concurrent iteration.
+3 stars
from 348 · score 1.39
52.akabe / ocaml-jupyter
An OCaml kernel for Jupyter (IPython) notebook
+3 stars
from 316 · score 1.39
53.fosskers / transducers
Transducers: Ergonomic, efficient data processing.
+3 stars
from 158 · score 1.39
54.stylewarning / cl-algebraic-data-type
Algebraic data types in Common Lisp
+3 stars
from 142 · score 1.39
55.JunggiKim / java-refined
Refinement and functional value types for Java 8+
+3 stars
from 5 · score 1.39
56.typelift / Swiftz
Functional programming in Swift
+2 stars
from 3,315 · score 1.10
57.fantasyland / static-land
Specification for common algebraic structures in JavaScript based on Fantasy Land
+2 stars
from 774 · score 1.10
58.hirrolot / mazeppa
A modern supercompiler for call-by-value functional languages
+2 stars
from 477 · score 1.10
59.emmanueltouzery / prelude-ts
Functional programming, immutable collections and FP constructs for typescript and javascript
+2 stars
from 383 · score 1.10
60.functionaljs / functional-js
A functional JavaScript library that facilitates currying and point-free programming
+2 stars
from 223 · score 1.10
61.fluture-js / Fluture
🦋 Fantasy Land compliant (monadic) alternative to Promises
+1 stars
from 2,489 · score 0.69
62.kefirjs / kefir
A Reactive Programming library for JavaScript
+1 stars
from 1,885 · score 0.69
63.Dobiasd / articles
thoughts on programming
+1 stars
from 1,583 · score 0.69
64.AOL-archive / cyclops
An advanced, but easy to use, platform for writing functional applications in Java 8.
+1 stars
from 1,323 · score 0.69
65.ghostdogpr / caliban
Functional GraphQL library for Scala
+1 stars
from 992 · score 0.69
66.izdi / elm-cheat-sheet
An overview of Elm syntax and features
+1 stars
from 947 · score 0.69
67.softwaremill / quicklens
Modify deeply nested case class fields
+1 stars
from 851 · score 0.69
68.derive4j / derive4j
Java 8 annotation processor and framework for deriving algebraic data types constructors, pattern-matching, folds, optics and typeclasses.
+1 stars
from 576 · score 0.69
69.argonaut-io / argonaut
Purely functional JSON parser and library in scala.
+1 stars
from 543 · score 0.69
70.rametta / pratica
🥃 Functional Algebraic Data Types
+1 stars
from 490 · score 0.69
71.Athari / YaLinqo
Yet Another LINQ to Objects for PHP [Simplified BSD]
+1 stars
from 449 · score 0.69
72.benji6 / virtual-audio-graph
:notes: Library for declaratively manipulating the Web Audio API
+1 stars
from 368 · score 0.69
73.TeaEntityLab / fpGo
Monad, Functional Programming features for Golang
+1 stars
from 354 · score 0.69
74.juspay / purescript-presto
Write Apps like Mathematical Equations!
+1 stars
from 240 · score 0.69
75.zalando / faux-pas
A library that simplifies error handling for Functional Programming in Java
+1 stars
from 143 · score 0.69
76.ehmicky / test-each
🤖 Repeat tests. Repeat tests. Repeat tests.
+1 stars
from 118 · score 0.69
77.rjNemo / underscore
🌟 Useful functional programming helpers for Go
+1 stars
from 117 · score 0.69
78.querycert / qcert
Compilation and Verification of Data-Centric Languages
+1 stars
from 60 · score 0.69
79.evpl / jkscope
Java scope functions inspired by Kotlin
+1 stars
from 23 · score 0.69