OCaml Packages

Explore thousands of open-source OCaml packages with their documentation.

Opam: The OCaml Package Manager

Opam is a source-based package manager for OCaml. It supports multiple simultaneous compiler installations, flexible package constraints, and a Git-friendly development workflow.

4446

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Featured Packages

Discover new and OCaml packages from featured community packages.

dune

Fast, portable, and opinionated build system

3.10.0

dream

Tidy, feature-complete Web framework

1.0.0~alpha5

js_of_ocaml

Compiler from OCaml bytecode to JavaScript

5.4.0

mirage

The MirageOS library operating system

4.4.0

Most Used Packages

odoc

OCaml documentation generator

Used by 1033 other packages

lwt

Promises and event-driven I/O

Used by 566 other packages

alcotest

Alcotest is a lightweight and colourful test framework

Used by 544 other packages

cmdliner

Declarative definition of command line interfaces for OCaml

Used by 380 other packages

fmt

OCaml Format pretty-printer combinators

Used by 331 other packages

New Packages

queenshead

British pub name generator

9 hours ago

melange-fetch

Fetch API support for Melange

14 hours ago

uri-bench

Benchmarking package for ocaml-uri

vscoq-language-server

VSCoq language server

8 days ago

Focus on Your Code, and opam Takes Care of Distributing It.

Our users have the highest standards for the OCaml ecosystem to run mission-critical applications across a variety of operating systems, and they expect that a package that compiles today will still work a decade from now.

Continuous Integration

Before any package update, we run sandboxed matrix builds for boundaries of the dependencies and for each of the dependent packages. A package publication will never break the rest of the ecosystem.

State of the Art

Opam supports publishing multiple versions of packages simultaneously to specify the version constraints, so only compatible revisions are chosen for a build. It comes with a performant constraint solver, a flexible CLI, a well-specified metadata format, and an easy access to the package manager logic via OCaml libraries.

Stability

The opam project and package repository is maintained by a team of developers who ensure that everything is not only running smoothly, but also curated to maintain a high degree of metadata quality. This makes it one of the most stable package repositories available today.

Start Contributing

Learn how to publish your first Opam package today and make it available to the rest of the community.

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