EclipseFP is an integrated environment for development in Haskell. Our goal is to provide a full-featured IDE that mimics the Eclipse JDT (the Java IDE which is flagship of the Eclipse project). Some planned and implemented features are support for code assistance, auto-building, refactoring and structural search.
The homepage for details and download is http://eclipsefp.sourceforge.net/.
We welcome any suggestions from the community. You can add your feature request to the following list, if you'd like.