The author of JSLint wrote:
"So I added one more line to my license, was that, “the Software shall
be used for Good, not Evil.” And thought: I’ve done my job!
/…/
Also about once a year, I get a letter from a lawyer, every year a
different lawyer, at a company. I don’t want to embarrass the company by
saying their name, so I’ll just say their initials, “IBM,” saying that
they want to use something that I wrote, 'cause I put this on everything
I write now. They want to use something that I wrote and something that
they wrote and they’re pretty sure they weren’t gonna use it for evil,
but they couldn’t say for sure about their customers. So, could I give
them a special license for that?
So, of course!
So I wrote back—this happened literally two weeks ago—I said, “I give permission to IBM, its customers, partners, and minions, to use JSLint for evil.” "
I’m not good enough to give recommendations, but meanwhile some questions might make it easier. What is your budget? Is open source important to you? What’s the biggest thing you want to print? Are there any special features you’re looking for? Do you want to tinker with it or rather have it “just work”?