I've been working on a php survey-builder script of my own for a couple of days now, and it's actually turning out to be quite decent. The output is standards-compliant and the structure of the survey as well as the question types are very flexible. Since the database access is completely dynamic, it handles multiple users very well and is adaptable. The user interface is drag and drop ajax at the moment, but it should also work without JavaScript. The output is currently "export to SPSS" only, but that's easily fixed if need be.

So, what I'm wondering is this: is there any competition or demand out there? The script currently powers only a single survey for a Pro Gradu thesis, so it didn't initially occur to me that there might be others interested in using it.