I'm a fan of PlantUML, despite some minor english translation problems:

PlantUML allows you to quickly write :

• sequence diagram,
• use case diagram,
• class diagram,
• activity diagram,
• component diagram,

I'm pretty sure I'm cracking up, because I laughed out loud at this statement in the Java 5.0 New Features page:

Lastly, after seven years, we've made jFrame.add equivalent to jFrame.getContentPane().add().I laugh because I've thought it was silly that it wasn't that way to start with ( Read more... )