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.
Gtk2Hs - - A GUI library for Haskell based on Gtk+. [Open source, LGPL.
Haggis - - Multi-threaded, concurrent user interface framework for Haskell, X Window.
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.
QtHaskell - - Haskell bindings for the Qt Widget Library from Trolltech AS.
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.