Repositories list

• blog

  Public
  Source for the community blog

  Python

  •3232 forks in leanprover-community/blog•1111 stars in leanprover-community/blog•44 issues in leanprover-community/blog•33 pull requests in leanprover-community/blog•Updated Oct 18, 2026Oct 18, 2026

• mathlib4

  Public
  The math library of Lean 4

  lean4

  lean4

  Lean

  •

  Apache License 2.0

  •1.8k1.8k forks in leanprover-community/mathlib4•4.3k4.3k stars in leanprover-community/mathlib4•293293 issues in leanprover-community/mathlib4•3.2k3.2k pull requests in leanprover-community/mathlib4•Updated Oct 18, 2026Oct 18, 2026

• mathlib4-nightly-testing

  Public
  nightly-testing and lean-pr-testing branches of Mathlib

  Lean

  •

  Apache License 2.0

  •1.8k1.8k forks in leanprover-community/mathlib4-nightly-testing•33 stars in leanprover-community/mathlib4-nightly-testing•00 issues in leanprover-community/mathlib4-nightly-testing•1414 pull requests in leanprover-community/mathlib4-nightly-testing•Updated Oct 18, 2026Oct 18, 2026

• batteries

  Public
  The "batteries included" extended library for the Lean programming language and theorem prover

  leanlean4

  leanlean4

  Lean

  •

  Apache License 2.0

  •166166 forks in leanprover-community/batteries•421421 stars in leanprover-community/batteries•2626 issues in leanprover-community/batteries•6868 pull requests in leanprover-community/batteries•Updated Oct 18, 2026Oct 18, 2026

• physlib

  Public
  A project to digitalise results from physics into Lean.

  physicstheorem-provinglean

  physicstheorem-provinglean

  Lean

  •

  Apache License 2.0

  •210210 forks in leanprover-community/physlib•795795 stars in leanprover-community/physlib•5353 issues in leanprover-community/physlib•6767 pull requests in leanprover-community/physlib•Updated Oct 18, 2026Oct 18, 2026

• flt-regular

  Public
  Fermat's Last Theorem for regular primes

  Lean

  •

  Apache License 2.0

  •77 forks in leanprover-community/flt-regular•7272 stars in leanprover-community/flt-regular•11 issue in leanprover-community/flt-regular•11 pull request in leanprover-community/flt-regular•Updated Oct 18, 2026Oct 18, 2026

• batteries-recycling

  Public
  Lean

  •

  Apache License 2.0

  •00 forks in leanprover-community/batteries-recycling•00 stars in leanprover-community/batteries-recycling•00 issues in leanprover-community/batteries-recycling•11 pull request in leanprover-community/batteries-recycling•Updated Oct 18, 2026Oct 18, 2026

• batteries-cell-template

  Public template
  Lean

  •

  Apache License 2.0

  •00 forks in leanprover-community/batteries-cell-template•00 stars in leanprover-community/batteries-cell-template•00 issues in leanprover-community/batteries-cell-template•11 pull request in leanprover-community/batteries-cell-template•Updated Oct 18, 2026Oct 18, 2026

• leanprover-community.github.io

  Public
  Hosts the website for mathlib and other Lean community infrastructure.

  CSS

  •

  MIT License

  •192192 forks in leanprover-community/leanprover-community.github.io•8484 stars in leanprover-community/leanprover-community.github.io•2020 issues in leanprover-community/leanprover-community.github.io•1919 pull requests in leanprover-community/leanprover-community.github.io•Updated Oct 18, 2026Oct 18, 2026

• mathlib-changelog

  Public
  Lean

  •

  MIT License

  •00 forks in leanprover-community/mathlib-changelog•1515 stars in leanprover-community/mathlib-changelog•33 issues in leanprover-community/mathlib-changelog•22 pull requests in leanprover-community/mathlib-changelog•Updated Oct 18, 2026Oct 18, 2026

• mathlib_stats

  Public
  Display gitstats output on the mathlib website

  Python

  •55 forks in leanprover-community/mathlib_stats•44 stars in leanprover-community/mathlib_stats•00 issues in leanprover-community/mathlib_stats•00 pull requests in leanprover-community/mathlib_stats•Updated Oct 18, 2026Oct 18, 2026

• crossref-exports

  Public
  JavaScript

  •22 forks in leanprover-community/crossref-exports•00 stars in leanprover-community/crossref-exports•00 issues in leanprover-community/crossref-exports•00 pull requests in leanprover-community/crossref-exports•Updated Oct 17, 2026Oct 17, 2026

• iris-lean

  Public
  Lean 4 port of Iris, a higher-order concurrent separation logic framework

  Lean

  •

  Apache License 2.0

  •6666 forks in leanprover-community/iris-lean•227227 stars in leanprover-community/iris-lean•2626 issues in leanprover-community/iris-lean•2121 pull requests in leanprover-community/iris-lean•Updated Oct 17, 2026Oct 17, 2026

• sphere-eversion

  Public
  Formalization of the existence of sphere eversions

  Lean

  •

  Apache License 2.0

  •1717 forks in leanprover-community/sphere-eversion•4949 stars in leanprover-community/sphere-eversion•00 issues in leanprover-community/sphere-eversion•22 pull requests in leanprover-community/sphere-eversion•Updated Oct 17, 2026Oct 17, 2026

• add-combi

  Public
  The sublibrary of Mathlib dedicated to additive combinatorics

  combinatoricslean4additive-combinatorics

  combinatoricslean4additive-combinatorics

  Lean

  •

  Apache License 2.0

  •44 forks in leanprover-community/add-combi•1919 stars in leanprover-community/add-combi•00 issues in leanprover-community/add-combi•11 pull request in leanprover-community/add-combi•Updated Oct 17, 2026Oct 17, 2026

• mathlib-at-ICERM26

  Public
  A fork of mathlib4 for team work during the May 2026 meeting at ICERM

  Lean

  •

  Apache License 2.0

  •1.8k1.8k forks in leanprover-community/mathlib-at-ICERM26•55 stars in leanprover-community/mathlib-at-ICERM26•00 issues in leanprover-community/mathlib-at-ICERM26•11 pull request in leanprover-community/mathlib-at-ICERM26•Updated Oct 16, 2026Oct 16, 2026

• repl

  Public
  A simple REPL for Lean 4, returning information about errors and sorries.

  Lean

  •

  Apache License 2.0

  •7272 forks in leanprover-community/repl•235235 stars in leanprover-community/repl•2626 issues in leanprover-community/repl•1919 pull requests in leanprover-community/repl•Updated Oct 16, 2026Oct 16, 2026

• lean4game

  Public
  Server to host Lean games

  reactlean4

  reactlean4

  TypeScript

  •

  GNU General Public License v3.0

  •110110 forks in leanprover-community/lean4game•569569 stars in leanprover-community/lean4game•125125 issues in leanprover-community/lean4game•2121 pull requests in leanprover-community/lean4game•Updated Oct 16, 2026Oct 16, 2026

• static-curl

  Public
  Static curl binaries

  Nix

  •00 forks in leanprover-community/static-curl•00 stars in leanprover-community/static-curl•00 issues in leanprover-community/static-curl•00 pull requests in leanprover-community/static-curl•Updated Oct 16, 2026Oct 16, 2026

• mathlib-landing

  Public
  CSS

  •

  MIT License

  •33 forks in leanprover-community/mathlib-landing•00 stars in leanprover-community/mathlib-landing•00 issues in leanprover-community/mathlib-landing•44 pull requests in leanprover-community/mathlib-landing•Updated Oct 16, 2026Oct 16, 2026

• mathlib4_copy

  Public
  A fork of the mathlib4 repo with CI disabled

  Lean

  •

  Apache License 2.0

  •1.8k1.8k forks in leanprover-community/mathlib4_copy•00 stars in leanprover-community/mathlib4_copy•00 issues in leanprover-community/mathlib4_copy•00 pull requests in leanprover-community/mathlib4_copy•Updated Oct 16, 2026Oct 16, 2026

• LeanProject

  Public template
  A template for blueprint-driven formalization projects in Lean.

  theorem-provingmathematicsproof-assistant+ 8

  theorem-provingmathematicsproof-assistantformal-mathematicsmathematical-programminglean-theorem-proverlean4formalisation-mathematicslean-blueprintformalised-mathematics+ 1

  Python

  •

  Apache License 2.0

  •1818 forks in leanprover-community/LeanProject•119119 stars in leanprover-community/LeanProject•11 issue in leanprover-community/LeanProject•11 pull request in leanprover-community/LeanProject•Updated Oct 16, 2026Oct 16, 2026

• lean4-metaprogramming-book

  Public
  lean4

  lean4

  Lean

  •

  Apache License 2.0

  •8080 forks in leanprover-community/lean4-metaprogramming-book•316316 stars in leanprover-community/lean4-metaprogramming-book•2424 issues in leanprover-community/lean4-metaprogramming-book•77 pull requests in leanprover-community/lean4-metaprogramming-book•Updated Oct 15, 2026Oct 15, 2026

• lean-update

  Public
  GitHub Action which automatically updates Lean projects

  github-actionslean4

  github-actionslean4

  Lean

  •

  MIT License

  •77 forks in leanprover-community/lean-update•77 stars in leanprover-community/lean-update•1212 issues in leanprover-community/lean-update•00 pull requests in leanprover-community/lean-update•Updated Oct 15, 2026Oct 15, 2026

• aesop

  Public
  White-box automation for Lean 4

  lean4

  lean4

  Lean

  •

  Apache License 2.0

  •6060 forks in leanprover-community/aesop•408408 stars in leanprover-community/aesop•3838 issues in leanprover-community/aesop•1515 pull requests in leanprover-community/aesop•Updated Oct 14, 2026Oct 14, 2026

• import-graph

  Public
  Tool to analyse the import structure of lean projects.

  lean4

  lean4

  Lean

  •

  Apache License 2.0

  •1818 forks in leanprover-community/import-graph•2828 stars in leanprover-community/import-graph•88 issues in leanprover-community/import-graph•1010 pull requests in leanprover-community/import-graph•Updated Oct 14, 2026Oct 14, 2026

• LeanSearchClient

  Public
  Syntax for searching with natural language from Lean, using https://leansearch.net/ (may extend to other services)

  Lean

  •

  Apache License 2.0

  •1414 forks in leanprover-community/LeanSearchClient•3737 stars in leanprover-community/LeanSearchClient•44 issues in leanprover-community/LeanSearchClient•33 pull requests in leanprover-community/LeanSearchClient•Updated Oct 14, 2026Oct 14, 2026

• quote4

  Public
  Intuitive, type-safe expression quotations for Lean 4.

  lean4

  lean4

  Lean

  •

  Apache License 2.0

  •2727 forks in leanprover-community/quote4•111111 stars in leanprover-community/quote4•1818 issues in leanprover-community/quote4•1313 pull requests in leanprover-community/quote4•Updated Oct 14, 2026Oct 14, 2026

• ProofWidgets4

  Public
  Helper toolkit for creating your own Lean 4 UserWidgets

  visualizationleanlean4

  visualizationleanlean4

  Lean

  •

  Apache License 2.0

  •4949 forks in leanprover-community/ProofWidgets4•229229 stars in leanprover-community/ProofWidgets4•1212 issues in leanprover-community/ProofWidgets4•11 pull request in leanprover-community/ProofWidgets4•Updated Oct 14, 2026Oct 14, 2026

• plausible

  Public
  Lean

  •

  Apache License 2.0

  •3131 forks in leanprover-community/plausible•117117 stars in leanprover-community/plausible•11 issue in leanprover-community/plausible•88 pull requests in leanprover-community/plausible•Updated Oct 14, 2026Oct 14, 2026