Possible FREE web surveys ( even tough i prefer to do my own design)

These are the 2 sites i found that allow me to do free surveys, with multiple answers (most of the others that i found, including SurveyMonkey are limited to 100 answers per survey).
These are Zoomerang and surveypopups.com.

I must say that i prefer to make my own survey and send it by email to the students.
But still, it´s always good to search for possibilities, if anything goes wrong,