RGtk2 is a binding for R to the GTK2 library and dependent libraries. You can use it to construct arbitrarily complex GUI's from R. Your GUI can be integrated with other GTK GUI's such as that of GGobi via rggobi. It works on all three major platforms (Linux, Mac, and Windows).
Osmo is a handy personal organizer, which includes calendar, tasks manager and address book modules. It was designed to be a small, easy to use and good looking PIM tool to help to manage personal information.
"Leksah is a Haskell IDE (Integrated Development Environment) written in Haskell based on Gtk+ and gtk2hs." Marks -> and greek symbols into sweet unicode glyphs. no vi mode :-/