
A set of modules for creating compilers in Haskell. [Open Source, GPL]
FranTk

A high level library for building GUIs in Haskell. It provides good support for developing complex dynamic systems, and is built on top of Tcl/Tk. [Open Source, BSD-like]
Fudgets

Graphical User Interface toolkit for Haskell and X Window system. [Free non-commercial use]
Gtk+Haskell

Bindings for GTK+ for Haskell.
Gtk2Hs

A GUI library for Haskell based on Gtk+. [Open source, LGPL]
Haggis

Multi-threaded, concurrent user interface framework for Haskell, X Window.
HaskellGnome

Haskell Gnome and ORBit effort and bindings
HaSQL Project

An ODBC interface to Haskell implemented using Green Card.
HGL Graphics Library

A portable graphics library for both X11 and Win32. [Open Source, BSD-like]
HOpenGL

An OpenGL/GLUT binding for Haskell. [Open Source, LGPL]
Java VM Bridge

A bridge to the Java virtual machine via JNI for Haskell. [Open Source, LGPL]
MySQL-HS

An interface to the database MySQL for the programming language Haskell. [Open Source, LGPL]
Regular expressions in Haskell

Native Haskell implementation of polymorphic regular expressions. The regexps contains most of the features found in Perl.
TclHaskell

Useful for building graphical user interfaces through the Tcl/Tk. [Open Source, BSD-like]
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