Applications and libraries

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The first place to look for data types or functions that do what you want is the Standard Prelude, then the Language and library specification (both parts of the Haskell standards documentation), then in whatever extra libraries are provided by the Haskell implementation you are using, then on the page you are looking at. If it is not here, then it may be in the archives of the Haskell Weekly News.

Search the standard libraries collection (by name or type signature) using Hoogle.

There is a mailing list for discussing issues related to libraries.

A large collection of standard hierarchical libraries are currently distributed with GHC (from version 5.04), Hugs (from Nov 2003), and nhc98 (from 1.16).

Cabal, The Common Architecture for Building Applications and Libraries, is an framework for packaging, building, and installing any tool developed in the Haskell language.

This page was intended as a comprehensive list of all Haskell libraries and tools. Because of Haskell's success, the list grew too large to be on one page, and it has now been split up. Some of the libraries and tools linked to from the library and tools pages are proof-of-concepts rather than production code. Some have no longer been maintained for a long time.

On freshmeat.com there is an alternative list of public domain software written in Haskell. That list is currently short (for you to change that), but in particular it displays the current development status of the software. Even more Haskell projects are documented in the community reports and in the archives of the Haskell Weekly News.

Program Development

See ProgramDevelopment.

Data structures

See DataStructures.

Extended Haskell

See ExtendedHaskell.

Interfacing with other languages and systems

Web services and Remote Procedure Call libraries

See RPC.

Tools for interfacing with other languages

See InterfacingOtherLanguages.

Databases

See DatabaseInterfaces.

Graphical User Interface Libraries

See GUILibraries.

Graphics

See Graphics.

Web, HTML, XML

See WebProgramming. For web services, see RPC.

Pretty-printer libraries

See PrettyPrinting.

Compiler, parsing and lexing tools

See CompilerTools.

Music

See Music.

Numerical algorithms and mathematics

See MathematicsLibraries.

Hardware verification

See HardwareVerification.

Robots

See Robots.

Genetic programming

See GeneticProgramming.

Natural language processing

See Linguistics.

Cryptography and hashing

See Cryptography.

Games

See Games.

Various

hs-plugins

A library for compiling and loading plugins into a running Haskell program.

HsShellScript

A library for using Haskell for tasks which are usually done by shell scripts, e.g. command line parsing, analysing paths, etc.

hMPI

hMPI is an acronym for HaskellMPI. It is a Haskell binding conforming to MPI (Message Passing Interface) standard 1.1/1.2. The programmer is in full control over the communication between the nodes of a cluster.

popenhs

A small library, based on runProcess in the standardised posix library. It provides lazy output from subprocesses.

Expander2

Expander2 is a flexible multi-purpose workbench for rewriting, verification, constraint solving, flow graph analysis and related procedures that build up proofs or computation sequences. Moreover, tailor-made interpreters display terms as 2D structures ranging from trees and rooted graphs to tables, fractals and other turtle-system-generated pictures.

EdComb

Editor combinators allow to assemble structure editors compositionally instead of generating them from descriptions, just as parsing combinators allow to assemble parsers compositionally instead of employing parser generators to generate parsers from grammar descriptions.

Regular expression library

Inspired by the Perl regular expression library, written purely in Haskell. Also part of the GHC distribution.

Dead

Smarty(via Internet Archive since 10/06/2003)

The world's smartest i/o device for Haskell. An interface between Haskell and Squeak, a freely available Smalltalk language and environment.

fun->pdf(via Internet Archive since 10/06/2003)

An implementation of a PDF dynamic writer in Haskell.

GetOpt (This link is dead. Fix it or remove it.)

A module for GNU-/POSIX-like option handling of commandline arguments

Collections of libraries

• John Meacham's Haskell tools and libraries
• Andrew Rock's library of useful modules
• Libraries by Ralf Hinze for data structures, sorting, searching, parsing, pretty printing, numerical algorithms, monads, etc.
• Ian Lynagh's Haskell libraries
• Reid Consulting's Libraries and Programs CMI, TSL, Knit, Greencard, HGL, HSX11, HSWin32

Dead

• Software available from the York FP group (This link is dead. Fix it or remove it.)
• Sven's Haskell Libaries (This link is dead. Fix it or remove it.) for interfacing to DaVinci, HTML/Cgi, OpenGL; a module for option handling, a Haskell parser, a binary library.
• Collection of Haskell modules (since 10/06/2003: via Internet Archive) by Jan Skibinski, Numeric Quest Inc.

Libraries for other languages

If you are thinking about designing a new library for Haskell, you ought to look what has been done in other languages. Here are standard library definitions for

• Scheme
• ML