I found this a year or so ago, but their offer still stands!
http://turbophp.com/ search for "free full licenses"
So, if you beta test it well and they like it, use your feedback, you get a license free.
EDIT: Quoting right now from their forum:
We have 2333 registered users
The newest registered user is 2stepsback
EDIT 2: CAUTION:
It seems their forum is spammed badly so i dunno whether the product is really very actively maintained....