I strongly recommend BOUML. It's a free UML modelling application, which:
- is extremely fast (fastest UML tool ever created, check out benchmarks),
- has rock solid C++ import support,
- has great SVG export support, which is important, because viewing large graphs in vector format, which scales fast in e.g. Firefox, is very convenient (you can quickly switch between "birds eye" view and class detail view),
- is full featured, impressively intensively developed (look at development history, it's hard to believe that so fast progress is possible).
So: import your code into BOUML and view it there, or export to SVG and view it in Firefox.
For the free version:
- source is on Github as DoUML
- Installers can be downloaded from http://www.bouml.fr/download.html
