UML Tools

1. List of UML Tools
http://www.objectsbydesign.com/tools/umltools_byCompany.html

2. List of UML Tools on wikipedia
http://en.wikipedia.org/wiki/List_of_UML_tools

3. On How to choose a UML Modeling tool
http://www.objectsbydesign.com/tools/modeling_tools.html

4. Another list here
http://plg.uwaterloo.ca/~migod/uml.html