in ubuntu I found some great softwares which can ease usage of UML . I introduce them for you:
Umbrello
Umbrello UML Modeller is a Unified Modelling Language diagram programme for Linux (KDE), Windows and MacOS .
the most exciting thing that I liekd about Umbrello is their Manual Handbook, which they explain all the cool things you can do with Umbrello .
as I read in the handbook, you can Import and Export Codes,
it means you can give a C++ Code to Umbrello and it will draw all the diagrams ! (class , state, squeience ,...)
BOUML
this is simple application, which at first you have to configure everything, like your browser, your editor , ... (it doesn't automaticly recognise your default applications)
you can define Classes, objects, their state and operations nd then generate their C++ or JAVA code .you can even generate diagrams for it
it is very fast and doesn't require much memory to manage several thousands of classes,
Dia Diagram Editor
this is another simple aplliciation which doesn't do much but it is a good Drawing application,
it has all the UML arrows and figures , if you want to draw a UML diagram by yourself , then it can give you a good hand !
