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GHC
[122 users on Ohloh]
Haskell is an advanced purely functional programming language. The product of more than twenty years of cutting edge research, it allows rapid development of robust, concise, correct software. With strong support for integration with other languages, built-in concurrency, debuggers, profilers, rich libraries and an active community, Haskell makes it easier to produce flexible, maintainable high-quality software.

GHC is a state-of-the-art, open source, compiler and interac...

Darcs
[107 users on Ohloh]
Darcs is a free, open source source code management system.

Every user has access to the full command set, removing boundaries between server and client or committer and non-committers.

Darcs is easy to learn and efficient to use because it asks you questions in response to simple commands, giving you choices in your work flow. You can choose to record one change in a file, while ignoring another. As you update from upstream, you can review each patch name, even the full "diff" for i...

xmonad
[66 users on Ohloh]
xmonad is a tiling window manager for X. Windows are arranged automatically to tile the screen without gaps or overlap, maximising screen use. All features of the window manager are accessible from the keyboard: a mouse is strictly optional. xmonad is written and extensible in Haskell. Custom layout algorithms, and other extensions, may be written by the user in config files. Layouts are applied dynamically, and different layouts may be used on each workspace. Xinerama is fully supported, allowi...
xmonad-contrib
[32 users on Ohloh]
xmonad is a minimalistic tiling window manager for X, written and extensible in Haskell. xmonad-contrib is the library of user-contributed extension modules to xmonad, providing a large collection of new layout algorithms, utilities, hooks, and more.
cabal
[29 users on Ohloh]
Cabal is a system for building and packaging Haskell libraries and programs. It defines a common interface for package authors and distributors to easily build their applications in a portable way.
Cabal is part of a larger infrastructure for distributing, organizing, and cataloging Haskell libraries and programs.
Pugs
[28 users on Ohloh]
An implementation of Perl 6 in Haskell, including the official Perl 6 test suite.
QuickCheck
[23 users on Ohloh]
Tags: haskell testing
A library for testing Haskell programs automatically. The programmer provides a specification of the program, in the form of properties which functions should satisfy, and QuickCheck then tests that the properties hold in a large number of randomly generated cases. Specifications are expressed in Haskell, using combinators defined in the QuickCheck library. QuickCheck provides combinators to define properties, observe the distribution of test data, and define test data generators.
bytestring
[21 users on Ohloh]
A time and space-efficient implementation of byte vectors using packed Word8 arrays, suitable for high performance use, both in terms of large data quantities, or high speed requirements. Byte vectors are encoded as strict Word8 arrays of bytes, held in a ForeignPtr, and can be passed between C and Haskell with little effort.
base
[20 users on Ohloh]
The Haskell base library. Fundamental functions and data structures included with every Haskell system.
HUGS
[20 users on Ohloh]
Hugs (Haskell User's Gofer System) (also Hugs 98) is a bytecode interpreter for the functional programming language Haskell. Hugs is the successor to Gofer, and was originally derived from Gofer version 2.30b.It offers fast compilation of programs and reasonable execution speed. It also comes with a simple graphics library. Hugs is good for people learning the basics of Haskell, but is by no means a "toy" implementation. It is the most portable and lightweight of the Haskell implementations.

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lambdabot
[20 users on Ohloh]
Lambdabot is an IRC bot written over several years by those on the #haskell IRC channel. It also operates in an offline mode as a Haskell development tool, and embedded as an extension to ghci.
parsec
[17 users on Ohloh]
Parsec is designed from scratch as an industrial-strength parser library. It is simple, safe, well documented (on the package homepage), has extensive
libraries and good error messages, and is also fast.
mtl
[15 users on Ohloh]
A monad transformer library, inspired by the paper Functional Programming with Overloading and
Higher-Order Polymorphism, by Mark P Jones (http://web.cecs.pdx.edu/~mpj/pubs/springschool.html),
Advanced School of Functional Programming, 1995.
xmobar
[14 users on Ohloh]
Xmobar is a minimalistic text based status bar.

Inspired by the Ion3 status bar, it supports similar features, like dynamic color management, output templates, and extensibility through plugins.

binary
[13 users on Ohloh]
Efficient, pure binary serialisation using lazy ByteStrings. Haskell values may be encoded to and form binary formats, written to disk as binary, or sent over the network. Serialisation speeds of over 1 G/sec have been observed, so this library should be suitable for high performance scenarios.
haddock
[13 users on Ohloh]
a tool for automatically generating documentation from annotated Haskell source code. It is primarily intended for documenting libraries, but it should be useful for any kind of Haskell code.
yi
[12 users on Ohloh]
Yi is a text editor written and extensible in Haskell. The goal of Yi is to provide a flexible, powerful and correct editor core dynamically scriptable in Haskell.
array
[10 users on Ohloh]
Standard Haskell arrays library.
zlib (Haskell)
[10 users on Ohloh]
Compression and decompression in the gzip and zlib formats for Haskell
haskell98
[9 users on Ohloh]
Tags: language haskell library programming
This package provides compatibility with the modules of Haskell 98 and the FFI
addendum, by means of wrappers around modules from the base package (which in
many cases have additional features). However Prelude, Numeric and Foreign are
provided directly by the base package.