Native Haskell implementation of polymorphic regular expressions. The regexps contains most of the features found in Perl. http://www.dcs.gla.ac.uk/~meurig/regexp/
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] http://haskell.cs.yale.edu/FranTk/