Cmdliner is a module for the declarative definition of command line interfaces. It provides a simple and compositional mechanism to convert command line arguments to OCaml values and pass them to your functions. The module automatically handles syntax errors, help messages and UNIX man page generation. It supports programs with single or multiple commands and respects most of the POSIX and GNU conventions.

This package provides a parser of email address according RFC822, RFC2822, RFC5321 and RFC6532. It handles UTF-8 email addresses and encoded-word according RFC2047.

This package is a line-reading library for OCaml that aims to replace readline.

Timed references for imperative state. This module provides an alternative type for references (or mutable cells) supporting undo/redo operations. In particular, an abstract notion of time is used to capture the state of the references at any given point, so that it can be restored. Note that usual reference operations only have a constant time / memory overhead (compared to those of the standard library).

Moreover, we provide an alternative implementation based on the references of the standard library (Pervasives module). However, it is less efficient than the first one.

Jsonm is a non-blocking streaming codec to decode and encode the JSON data format. It can process JSON text without blocking on IO and without a complete in-memory representation of the data.

Astring exposes an alternative String module for OCaml. This module balances minimality and expressiveness for basic, index-free, string processing and provides types and functions for substrings, string sets and string maps. The String module exposed by Astring has exception safe functions, removes deprecated and rarely used functions, alters some signatures and names, adds a few missing functions and fully exploits OCaml's newfound string immutability.

Ppx_yojson_conv_lib is the runtime library used by ppx_yojson_conv, a ppx rewriter that can be used to convert ocaml types to a Yojson.Safe value.

Ppx_deriving_yojson is a ppx_deriving plugin that provides a JSON codec generator.

The ocaml-integers library provides a number of 8-, 16-, 32- and 64-bit signed and unsigned integer types, together with aliases such as long and size_t whose sizes depend on the host platform.

base-quickcheck provides randomized testing in the style of Haskell's Quickcheck library, with support for built-in types as well as types provided by Base.

Dune is a build system for OCaml. It provides a consistent experience and takes care of the low-level details of OCaml compilation. Descriptions of projects, libraries and executables are provided in dune files following an s-expression syntax.

Odoc is a documentation generator for OCaml. It reads doc comments, delimited with (** ... *), and outputs HTML.

Text inside doc comments is marked up in ocamldoc syntax. Odoc's main advantage over ocamldoc is an accurate cross-referencer, which handles the complexity of the OCaml module system.

This package allows parsing of dates that follow the ISO 8601 and RFC 3339 formats in OCaml.

Uses the new result type defined in OCaml >= 4.03 while staying compatible with older version of OCaml should use the Result module defined in this library.

This library helps embed location information inside executables and libraries

Provides a single function to report the current time in nanoseconds since the start of the Unix epoch.

Tsdl is an OCaml library providing thin bindings to the cross-platform SDL C library.

Fpath is an OCaml module for handling file system paths with POSIX or Windows conventions. Fpath processes paths without accessing the file system and is independent from any system library.

Piqilib is the common library used by the piqi command-line tool and piqi-ocaml.

This package provides ppx_sexp_message-like extension nodes for lazily rendering log messages.

Merlin is an editor service that provides modern IDE features for OCaml. Emacs and Vim support is provided out-of-the-box. External contributors added support for Visual Studio Code, Sublime Text and Atom.

Eio_linux provides a Linux io-uring backend for Ocaml Eio APIs, plus a low-level API that can be used directly (in non-portable code).

Define a standard set of libraries which may be expected on every compliant installation of OCaml and organize these libraries into a hierarchy of modules.

Crowbar is a library for testing code, combining QuickCheck-style property-based testing and the magical bug-finding powers of afl-fuzz.