I am evaluating Gravity Forms by testing with the downloaded software, but without a license. I see that it is licensed under the GNU general public license. So I assume that it is ok to use an unlicensed copy, provided that I comply with the GNU GPL terms.
I am a developer with 40+ years experience and I am ethically opposed to using software illegally. If I deploy the software for any commercial use, I will certainly purchase a license. I just wanted to verify that I can use it for testing and evaluation.
It looks like a solid product, and I am very impressed with what I have seen so far.
~ranwaldo
[edited for typos]