I personally use this one:
http://arbaro.sourceforge.net/
This is presented as a tool for POV-Ray, but you don't even need POV-Ray --- you can export trees directly to .OBJ format. And you can do it with/without leaves (plus quite a few other options).
Requires Java, and it is not the most intuitive interface/setup, but the price is right (free).
I actually thought of making a tree plugin until I found this one, as nothing in my price range produced thrilling results --- there are things I'd like to change about this one where the UI and leaf-placement are concerned, but so far not enough that I've been willing to mess with it.
hth,
Dennis