EclipseFP is an Haskell-IDE based on Eclipse:
More information is available on the EclipseFP Homepage.
Details for EclipseOn_Mac_OS_X
- integration with WinHugs
- ability to "fall in" definition of identifier under cursor, including multi-level ability to return back (with support for base libraries, libraries i installed and current project)
- auto-indenting with user-tuned style