RxNDA.com: Painless Commercial NDAs Online
rxnda.com
rxnda.com
I like it.
Fundamentally, the software doesn't matter much. Are the forms good? Are they easy to review? Are the terms of use clear and reasonable? Does the signature mechanism work? Are the folks and systems behind it resisting the pressure to horde my data and do creepy things with it?
I think slick SaaS marketing would make me more suspicious, not less, that I wouldn't like the answers to some of those questions.
The "stack", methinks, is pretty irrelevant. I did mine in plain Node.js. Storage to SSD filesystem. JS mostly so I could reuse some open-source contract automation work I'd done under the Common Form umbrella.