Vote for your favorite UML modeling tool. There is no "best UML modeling tool". The best tool for project A is another than the best tool for project B. It depends on the different requirements of the projects. This list shows not the best, but the most popular tools if you vote for them. I've added all UML modeling tools I know and a short description taken from the tool vendor web sites. Please let me know if you want to add another one. See http://www.oose.de/uml-tools for a more detailed list.