[class] Tools for creating Class Diagrams

Please suggest tools for creating Class Diagrams with the following criteria:

• It should be platform-independent because I use Linux and the file is expected to be edited by other members of the team using Windows/Mac
• Free, because there no such free tool, we should create one
• It would also be nice if you can include a screenshot of the class diagram produced, just to make sure that the tool is actually used for creating Class Diagrams and not just any other types of diagrams

Also, please only suggest the tools that you've actually used.

UPDATE: Please DO NOT include those UML Diagram tools that cannot create Class Diagrams.

I always use Gliffy works perfectly and does lots of things including class diagrams.

BOUML is free, can reverse-engineer Java and C++

Umbrello UML Modeller is a Unified Modelling Language diagram programme for KDE. UML allows you to create diagrams of software and other systems in a standard format. Our handbook gives a good introduction to Umbrello and UML modelling. http://uml.sourceforge.net/

I have used both Poseidon UML and Enterprise Architect and must say that I prefer Poseidon but wasn't fully satisfied with any of them.

Since all these tools lack a validation function their outcomes are just drawings and no better tool for creating nice drawings is a piece of paper and pen. Afterwards you can scan your diagrams and insert them into your team's wiki.

I use StarUML. It works quite good.

I used Poseidon UML Community Edition, it's platform independent and makes fine and clean diagrams. There are some screenshots here.

A nice online tool: yUML

WhiteStarUML is a fork of StarUML that is still maintain http://sourceforge.net/projects/whitestaruml/?source=dlp.

Some time ago I used DIA - free and platform-independent. It was ok. Now I use Enterprise Architect but it's not free.

I've used Enterprise Architect in the past - not free, but not too expensive, and it produces nice diagrams.

Just discovered GenMyModel, an awesome UML modeler to design class diagram online