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 there is an alternative list of software written in Haskell. That list is currently short (for you to change that). Even more Haskell projects are documented in the community reports and in the archives of the Haskell Weekly News.

Categories of Libraries and Tools

Various Libraries

If you figure you a good category for any of these libraries, please move it to the appropriate page, or make a new page and link to it above.

A library for compiling and loading plugins into a running Haskell program.
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.
A small library, based on runProcess in the standardised posix library. It provides lazy output from subprocesses.
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.
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.
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.

Collections of libraries

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