Ask HN: Half-Decent FOSS Survey Software

I'm interested in putting together a moderately complicated survey, and am pretty shocked at the apparent dearth of options. Scanning Google and Github didn't pull up very much promising software:

* http://www.limesurvey.org/

* http://www.surveyproject.org/

I'd self-host. The survey itself would have multiple-choice questions which can branch/skip and some free-choice sections. It needs reasonably customizable styles so it doesn't have to look like it's from 1998. Easy-to-implement iframe embed-ability would be a big plus.

Honestly, I could roll something like this myself in a week, which is why I figure Someone Must Have Done It Already. But who?