1.lichess-org / lila
♞ lichess.org: the forever free, adless and open source chess server ♞
+170 stars
from 18,766 · score 5.14
Trending repositories
Ranked by Attention Score: stars gained over the last 30 complete days
59 repositories by Attention Score · Oct 4, 2026 – Nov 2, 2026 (UTC)
2.NixOS / nix
Nix, the purely functional package manager
+159 stars
from 17,799 · score 5.08
3.roc-lang / roc
A fast, friendly, functional language.
+97 stars
from 6,084 · score 4.58
4.jank-lang / jank
jank is the native Clojure dialect with seamless C++ interop.
+45 stars
from 3,326 · score 3.83
5.KuroLabs / stegcloak
Hide secrets with invisible characters in plain text securely using passwords 🧙🏻♂️⭐
+37 stars
from 3,895 · score 3.64
6.supermacro / neverthrow
Type-Safe Errors for JS & TypeScript
+34 stars
from 7,728 · score 3.56
7.hemanth / functional-programming-jargon
Jargon from the functional programming world in simple terms!
+25 stars
from 18,717 · score 3.26
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。
+19 stars
from 11,278 · score 3.00
9.coalton-lang / coalton
Coalton is an efficient, statically typed functional programming language that supercharges Common Lisp.
+18 stars
from 1,768 · score 2.94
10.hmemcpy / milewski-ctfp-pdf
Bartosz Milewski's 'Category Theory for Programmers' unofficial PDF and LaTeX source
+16 stars
from 11,689 · score 2.83
11.apache / groovy
Apache Groovy: A powerful multi-faceted programming language for the JVM platform
+13 stars
from 5,469 · score 2.64
12.dotnet / fsharp
The F# compiler, F# core library, F# language service, and F# tooling integration for Visual Studio
+11 stars
from 4,337 · score 2.48
13.MostlyAdequate / mostly-adequate-guide
Mostly adequate guide to FP (in javascript)
+10 stars
from 23,806 · score 2.40
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
+10 stars
from 14,524 · score 2.40
15.dry-python / returns
Make your functions return something meaningful, typed, and safe!
+10 stars
from 4,373 · score 2.40
16.getify / Functional-Light-JS
Pragmatic, balanced FP in JavaScript. @FLJSBook on twitter.
+9 stars
from 16,711 · score 2.30
17.sharkdp / cube-composer
A puzzle game inspired by functional programming
+9 stars
from 2,045 · score 2.30
18.gcanti / fp-ts
Functional programming in TypeScript
+8 stars
from 11,540 · score 2.20
19.cyclejs / cyclejs
A functional and reactive JavaScript framework for predictable code
+7 stars
from 10,220 · score 2.08
20.AllThingsSmitty / must-watch-javascript
JavaScript talks you have to see 👀 on functional programming, performance, frameworks, React, debugging, leveling up, and more!
+6 stars
from 7,133 · score 1.95
21.LuxLang / lux
The Lux Programming Language
+6 stars
from 1,744 · score 1.95
22.lettier / gifcurry
😎 The open-source, Haskell-built video editor for GIF makers.
+6 stars
from 1,448 · score 1.95
23.novalagung / gubrak
⚙️ Golang functional utility library with syntactic sugar. It's like lodash, but for Go
+6 stars
from 513 · score 1.95
24.louthy / language-ext
C# pure functional programming framework - come and get declarative!
+5 stars
from 7,078 · score 1.79
25.ring-lang / ring
A simple, lightweight, flexible, embeddable, portable and multi-paradigm dynamic programming language for developing applications, tools, and domain-specific languages
+5 stars
from 1,465 · score 1.79
26.monix / monix
Asynchronous, Reactive Programming for Scala and Scala.js.
+4 stars
from 1,928 · score 1.61
27.funkia / list
🐆 An immutable list with unmatched performance and a comprehensive functional API.
+4 stars
from 1,647 · score 1.61
28.awalterschulze / goderive
Derives and generates mundane golang functions that you do not want to maintain yourself
+4 stars
from 1,262 · score 1.61
29.Oaxoa / fp-filters
A curated list of ready-to-use (functional programming) array filters (TS / ESM / CJS)
+4 stars
from 94 · score 1.61
30.liuxinyu95 / AlgoXY
Book of Elementary Functional Algorithms and Data structures
+3 stars
from 6,325 · score 1.39
31.typelead / eta
The Eta Programming Language, a dialect of Haskell on the JVM
+3 stars
from 2,636 · score 1.39
32.typelevel / fs2
Compositional, streaming I/O library for Scala
+3 stars
from 2,453 · score 1.39
33.luafun / luafun
Lua Fun is a high-performance functional programming library for Lua designed with LuaJIT's trace compiler in mind.
+3 stars
from 2,263 · score 1.39
34.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
35.tidyverse / purrr
A functional programming toolkit for R
+3 stars
from 1,408 · score 1.39
36.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.
+3 stars
from 1,366 · score 1.39
37.scalaz / scalaz
Principled Functional Programming in Scala
+2 stars
from 4,668 · score 1.10
38.evhub / coconut
Simple, elegant, Pythonic functional programming.
+2 stars
from 4,354 · score 1.10
39.vkhorikov / CSharpFunctionalExtensions
Functional extensions for C#
+2 stars
from 2,831 · score 1.10
40.typelevel / skunk
A data access library for Scala + Postgres.
+2 stars
from 1,665 · score 1.10
41.gigobyte / purify
Functional programming library for TypeScript - https://gigobyte.github.io/purify/
+2 stars
from 1,605 · score 1.10
42.hirrolot / mazeppa
A modern supercompiler for call-by-value functional languages
+2 stars
from 477 · score 1.10
43.Suor / funcy
A fancy and practical functional tools lib
+1 stars
from 3,505 · score 0.69
44.typelift / Swiftz
Functional programming in Swift
+1 stars
from 3,316 · score 0.69
45.Dobiasd / FunctionalPlus
Functional Programming Library for C++. Write concise and readable C++ code.
+1 stars
from 2,295 · score 0.69
46.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
47.imteekay / functional-programming-learning-path
✨ A Learning Path for Functional Programming
+1 stars
from 1,044 · score 0.69
48.domn1995 / dunet
C# discriminated union source generator
+1 stars
from 887 · score 0.69
49.softwaremill / quicklens
Modify deeply nested case class fields
+1 stars
from 851 · score 0.69
50.javadev / underscore-java
java port of Underscore.js
+1 stars
from 550 · score 0.69
51.wavebitscientific / functional-fortran
Functional programming for modern Fortran
+1 stars
from 438 · score 0.69
52.emmanueltouzery / prelude-ts
Functional programming, immutable collections and FP constructs for typescript and javascript
+1 stars
from 384 · score 0.69
53.TomerAberbach / lfi
🦥 A lazy functional iteration library supporting sync, async, and concurrent iteration.
+1 stars
from 350 · score 0.69
54.functionaljs / functional-js
A functional JavaScript library that facilitates currying and point-free programming
+1 stars
from 224 · score 0.69
55.fosskers / transducers
Transducers: Ergonomic, efficient data processing.
+1 stars
from 160 · score 0.69
56.stylewarning / cl-algebraic-data-type
Algebraic data types in Common Lisp
+1 stars
from 144 · score 0.69
57.ehmicky / test-each
🤖 Repeat tests. Repeat tests. Repeat tests.
+1 stars
from 118 · score 0.69
58.querycert / qcert
Compilation and Verification of Data-Centric Languages
+1 stars
from 60 · score 0.69
59.JunggiKim / java-refined
Refinement and functional value types for Java 8+
+1 stars
from 7 · score 0.69