Rational Rose and Enterprise Architect -- but these are paid ones. Of course if you want to learn then these work fine.

For free modelling tools which generate source code from UML and vice versa look here

BTW these tools are not called reverse engineering tools they are called Modellign Tools -- reverse engg implies in the sense of coding to hack open the .exe file and work with the Assembly language to make the required changes (normally used for making cracks for illegal softwares).

Hope it helped, bye.