Here are some options for using Haskell with various IDEs:
- EclipseFP, plugin for Eclipse
- Visual Haskell, based on Microsoft's Visual Studio
- Leksah, an IDE for Haskell written in Haskell based on GTK+/gtk2hs.
- plugin for Xcode
- hIDE, now apparently orphaned
- Haskell mode for Emacs
- Vim as a Haskell IDE, first steps, (a tour with screenshots)