BOUML is a free UML 2 tool box (under development) allowing you to specify and generate code in C++, Java and Idl.
BOUML runs under Unix/Linux/Solaris, MacOS X(Power PC and Intel) and Windows. BOUML is extensible, and the external tools named plug-outs can be written in C++ or Java, using BOUML for their definition as any other program. The code generators and reverses are ones of the pre-defined plug-outs included in the BOUML distribution.