Is anyone aware of a maintained easy to use flowchart extension?

I need something that can do a simple decision-tree type of chart. I've been playing with FlowchartWiki, which is powerful but not quite what I need. I need to have descriptive text in the boxes and along the links.

I found Graph extension which looks like it does what I need, but it look unmaintained; at least the pages have not been updated in almost 3 years and some of the examples date back to 2006... It also requires a fairly complex layering of php and perl and a few other things....

I'd appreciate any input or suggestions.

Thanks!