Fmt exposes combinators to devise Format pretty-printing functions.

Hex is a minimal library providing hexadecimal converters.

This package provides types and operations over dates and times.

Timezone handles parsing timezone data and create Timezone.t that can later be used to manipulate time in core_kernel or core.

Uunf is an OCaml library for normalizing Unicode text. It supports all Unicode normalization forms. The library is independent from any IO mechanism or Unicode text data structure and it can process text without a complete in-memory representation.

The Core suite of libraries is an alternative to OCaml's standard library that was developed by Jane Street.

This package provides an OCaml library for interacting with files in the TOML format. Specifically, it provides a parser, a serializer, and a pretty printer.

Modules using ppx_module_timer have instrumentation to record their startup time.

This package can automatically generate runtime types from type definitions.

MirageOS OS library for Xen targets, which handles the main loop and timers. It also provides the low level C startup code and C stubs required by the OCaml code.

CamlPDF is an OCaml library that provides functionality for reading, writing, and modifying PDF files. It serves as the foundation for the cpdf command-line tool and various API bindings.

Implements arithmetic and logical operations over arbitrary-precision integers. It uses GMP to efficiently implement arithmetic over big integers. Small integers are represented as Caml unboxed integers, for speed and space economy.

Lwt provides typed, composable cooperative threads. These make it easy to run normally-blocking I/O operations concurrently in a single process. Also, in many cases, Lwt threads can interact without the need for locks or other synchronization primitives.

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.

Provides an OCaml interface to operations that have dedicated hardware instructions on some micro-architectures, with default implementations using C stubs for all targets.

Cohttp is an OCaml library for creating HTTP daemons. It has a portable HTTP parser, and implementations using various asynchronous programming libraries.

Bos provides support for basic and robust interaction with the operating system in OCaml. It has functions to access the process environment, parse command line arguments, interact with the file system and run command line programs.

The graphics library provides a set of portable drawing primitives. Drawing takes place in a separate window that is created when Graphics.open_graph is called. This library used to be distributed with OCaml up to OCaml 4.08.

Cstruct is a library and syntax extension to make it easier to access C-like structures directly from OCaml. It supports both reading and writing to these structures, and they are accessed via the Bigarray module.

ANSITerminal is a module allowing to use the colors and cursor movements on ANSI terminals.

Used to trace execution of OCaml/Lwt programs (such as Mirage unikernels) at the level of Lwt threads. The traces can be viewed using JavaScript or GTK viewers provided by mirage-trace-viewer or processed by tools supporting the Common Trace Format. When compiled against a normal version of Lwt, OCaml's cross-module inlining will optimise these calls away, meaning there should be no overhead in the non-profiling case.

A ppx rewriter that rewrites simple match statements with an if then else expression.

Library to provide pure OCaml functions to manipulate real file (POSIX like) and filename.

Traditional implementation of priority queues using a binary heap encoded in a resizable array.