Applications and libraries

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This page is being restructured, if possible refrain from editing it today. If you want to add something send an e-mail to bringert@cs.chalmers.se -- BjornBringert, 2006-03-22

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 an effort underway to standardise many of the extra libraries that come with Haskell implementations, and at the same time extend the module namespace into a hierarchy. A document describing this project can be found here, and 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 is intended as a comprehensive list of all Haskell libraries and tools. Some of these 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

The contents of this section have been moved to ProgramDevelopment.

Data structures

The contents of this section have been moved to DataStructures.

Extended Haskell

The contents of this section have been moved to ExtendedHaskell.

Interfacing with other languages and systems

Web services libraries

The contents of this section have been moved to WebServices.

Tools for interfacing with other languages

The contents of this section have been moved to InterfacingOtherLanguages.

Interfaces to specific systems

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.
CGI Library
CGI programs can receive input from the client's web browser, encoded in a complicated fashion, and can write output in a variety of formats (plain text, HTML, JPEG etc) which the client then sees. The decoding and encoding of the IO is often expressed in PERL or C, and makes CGI applications tedious and awkward to write. Haskell/CGI is a library for writing CGI programs in Haskell 1.3 and above.
CGI Library
An all-in-one-file version of Erik Meijer's CGI library (above) with some bugs fixed, a few extensions and ported to Haskell 98.
daVinci binding
A binding to daVinci, an X-Windows based visualization tool for directed graphs.
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.
Smarty(since 10/06/2003: via Internet Archive)
The world's smartest i/o device for Haskell. An interface between Haskell and Squeak, a freely available Smalltalk language and environment.
popenhs
A small library, based on runProcess in the standardised posix library. It provides lazy output from subprocesses.
haskell-corba
This package allows Haskell programmers to write CORBA clients and servers using the MICO open-source CORBA implementation. It defines a Haskell language mapping for CORBA, and includes an IDL compiler which generates Haskell stub and skeleton modules from IDL files.

Interfacing with databases

The contents of this section have been moved to DatabaseInterfaces.

Graphical User Interface Libraries

The contents of this section have been moved to GUILibraries.

Graphics

The contents of this section have been moved to Graphics.

Web, HTML, XML

The contents of this section have been moved to WebProgramming.

Pretty-printer libraries

The contents of this section have been moved to PrettyPrinting.

Compiler and compilation tools

The contents of this section have been moved to CompilerTools.

Music

The contents of this section have been moved to Music.

Numerical algorithms and mathematics

Geometric Algorithms
A small Haskell library, that contains algorithms for two-dimensional convex hulls, triangulations of polygons, Voronoi-diagrams and Delaunay-triangulations, the QEDS data structure, kd-trees and range-trees.
Digital Signal Processing
Modules for matrix manpulation, digital signal processing, spectral stimation, and frequency estimation.
Papers by Jerzy Karczmarczuk
Some interesting uses of Haskell in mathematics, including functional differentiation, power series, continued fractions.
DoCon - Algebraic Domain Constructor
A small Computer Algebra System
HaskellMath
The HaskellMath library is a sandbox for me to experiment with mathematics algorithms. So far I've implemented a few quantitative finance models (Black Scholes, Binomial Trees, etc) and basic linear algebra functions. Next I might work on either computer algebra or linear programming. All comments welcome!
Wrapper to CLAPACK
GSLHaskell
High level functional interface to standard linear algebra computations and other numerical algorithms based on the GNU Scientific Library.
Numeric Prelude
Experimental revised framework for numeric type classes.
Exact Real Arithmetic
A portal-like treatment of the topic. There are functional programming materials too, even with downloadable Haskell source.
Probabilistic Functional Programming
The PFP library is a collection of modules for Haskell that facilitates probabilistic functional programming, that is, programming with stochastic values. The probabilistic functional programming approach is based on a data type for representing distributions. A distribution represent the outcome of a probabilistic event as a collection of all possible values, tagged with their likelihood. A nice aspect of this system is that simulations can be specified independently from their method of execution. That is, we can either fully simulate or randomize any simulation without altering the code which defines it.
mirror of the following numeric modules of Jan Skibinski
Numerics with fractions(since 10/06/2003: via Internet Archive)
Roots of polynomials(since 10/06/2003: via Internet Archive)
It implements the well known Laguerre's method for finding complex roots of polynomials.
Indexless linear algebra algorithms(since 10/06/2003: via Internet Archive)
Orthogonalization, solution of linear equations, eigenvalues and eigenvectors.
State vector evolution(since 10/06/2003: via Internet Archive)
Short study of fuzzy oscillator(since 10/06/2003: via Internet Archive)
N-dimensional tensors(since 10/06/2003: via Internet Archive)
Sinc function

Hardware verification

Hawk, Specifying and Prototyping Microprocessors
The goal of the Hawk project is to develop a language for expressing highly abstracted specifications of modern microprocessor designs, to provide design teams with the ability to dynamically explore a wide range of design choices. The Hawk language is Haskell plus the Hawk library.
Lava
Lava is a hardware description language based upon Haskell.

Robots

Haskell for Vision and Robotics
Frob is an Embedded Domain Specific Language for controlling robots. It is built using the principals of Functional Reactive Programming, as developed by Conal Elliott for the Fran animation system. The current incarnation of Frob is part of the Yampa FRP system.

Cognitive Science

(Tools, algorithms, frameworks, paradigms concerning Genetic Programming, Artificial Intelligence, Neural Networks, Fuzzy Logic, Natural Language Processing etc.)

Genetic programming

Dr. Tina Yu's publications, many of them on fruitful applications of Functional Programming in Genetic Programming.

Deryck F. Brown, A. Beatriz Garmendia-Doval and John A. W. McCall, A Genetic Algorithm Framework Using Haskell

Natural language processing

See the Linguistics page.


Various

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.
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.
Strafunski
Strafunski is a Haskell bundle that provides support for generic programming in Haskell, based on the concept of a functional strategy. It consists of a combinator library (StrategyLib) and a precompiler (DrIFT-Strafunski).
FunGEn - a game engine for Haskell
FunGEn (Functional Game Engine) is a 2D platform-independent game engine implemented in and for Haskell, using HOpenGL. It is intended to help game programmers in the game development process, in a faster and automated way.
The Haskell Cryptographic Library
A library of cryptographic functions collected together in one package.
RSA
A number theory library, RSA library, and RSA programs.
Implementations of MD5, SHA1 and DES
Regular expression library
Inspired by the Perl regular expression library, written purely in Haskell. Also part of the GHC distribution.
Partial v0.1
The Partial library provides a partial order class. It also provides routines for generating a Hasse diagram from a set and a partial order. Renderers are provided for the abstract Hasse diagram representation into LaTeX (via Xy-pic) and into dot, the format for AT&T's Graphviz tools. Since no horizontal sorting is done, the Xy-pic output is rather poor at present; dot does a much better job with its layout optimisation algorithm.
fun->pdf(since 10/06/2003: via Internet Archive)
An implementation of a PDF dynamic writer in Haskell.
GetOpt
A module for GNU-/POSIX-like option handling of commandline arguments

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

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