Monkey Studio is a Free crossplatform Qt© 4 IDE.

The current major version is 1.x.x. The team is working on the next V2 witch will add some new features like complete designer integration, class viewer, abstract debuger support as well as abstract compiler(s)!
This Project is the first and so the oldest one building an Integrated Development Environment for Qt© 4. Always copied, always concurrenced, but Monkey Studio is still there!

The project has been started by Azevedo Filipe aka Nox P@sNox. He developed it for his own needs and released the first version to the public around end of June 2005.

Some guys joined the project:
Yannick aka Xiantia works on the debugger Integration (gdb), Julian Fred aka anacr0x is working on the code completion (that need ctags for working), Mashin Evgeniy aka evgenM helps with code indentation and some other stuff, Fathi Boudra aka fabo create the debian packages and finally Merlin Paul aka Eskatos create the gentoo ebuilds

Monkey Studio is released under the GNU GPL. Its based on Qt Libray 4.1.x for the 1.x.x series. The V2 will be a 4.2.x version only.
It has been tested on Windows XP/Windows 2000, Mandriva 2006, Suse 10, Gentoo and Ubuntu/Kubuntu Dapper, Mac OS X has been report to be working too.

Qt© is a registered trademark of Trolltech