Buddha - http://www.cs.mu.oz.au/~bjpop/buddha/ A declarative debugger for the Haskell 98.
APSET - http://www.macs.hw.ac.uk/~gnik/apset/ A project to provide better run-time profiling information for GpH.
Green Card - http://haskell.cs.yale.edu/greencard/ A foreign function interface preprocessor, simplifying the task of interfacing Haskell programs to external libraries.
HaskellDirect - http://haskell.cs.yale.edu/hdirect/ An (Independent definition language) IDL compiler for Haskell. Can be used to interface foreign language libraries and call COM methods from Haskell.
Happy - http://haskell.cs.yale.edu/happy/ A parser generator for Haskell.
DrIFT - http://www.dcs.gla.ac.uk/~nww/derivehome.html A Haskell preprocessor for generating instances of classes.
The Haskell FFI Binding Modules Generator (HSFFIG) - http://hsffig.sourceforge.net A tool that takes a C library include file (.h) and generates Haskell Foreign Functions Interface import declarations for items (functions, structures, etc.) the header defines. [Open source, BSD License]
VersionTool - http://www.cse.unsw.edu.au/~chak/haskell/VersionTool/ A tiny utility that extracts version information from a .cabal file and from darcs, and then, inserts it into a source file.
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