We're looking for free/cheap or open source UML tools. What tools have you used ? It's OK if there are 2 tools, one each for Flow charts and UML.
If a UML tool or Flow Chart tool is cheap(we're a NON-PROFIT), and no open source is good enough, we're open to look at them.
Simple and easy to use: JudeUML. There is a free Community Edition.
This software is now released as astah community.