!!! Rational Rose

This begain it's life as a good old fashioned CASE tool, it was to my knowledge one of the first tools to support the UML.

JohnV: ''Opinion''! - This tool shows it's age a bit, but I always considered it to be the "Gold-standard" by which all other [UML Tools] are judged.  It's comprehensive but has it's quirks.  It's scripting language is a wacked up sorta visual basic, yuck!  It's expensive and given Rationals new RationalXDE and thier purchase by IBM, I would not be surprised to see it get end-of-life'd soon.

See [UML Tools]