Freeware Project-Manager do-dad is on the aminet for SAS (last I heard the developer wanted to add support for GCC)
Storm4, has StormWizard (but I've never used it) which is RAD in it's concept.
If you are thinking of VisualBasic type dev-kits, StormWizard is the closest thing I know of.
Personally, I find that the single most used developer application for the Amiga that I use is GoldEd Studio. It's basically a text editor, but GoldED puts IPC to great use by having modules for Storm, SAS, GCC, Web-Browsers, ARexx, Installer--even PHP ;-)
Golly, it's Targhan the info-mercial! If you call within the next 10 minutes you get a free registration card! With thousands of uses, you'll wonder how we ever could dispose of a registration card for free! :roflmao: