Easy Survey Package
   PHP scripts that make creating and administration of site surveys easier for non-technical users and helps them gather the results, and view common statistics. Uses a MySQL backend. Once installed administration can be done entirely on the web [Open Sour
   http://sourceforge.net/projects/phpesp/

IdioPoll
   A polling script with database-driven structure and skin support.
   http://sethkinast.com/work/idiopoll/

Poll and Voting Script
   Template driven script to provide votes and polls on a website.
   http://www.stadtaus.com/en/php_scripts/voting_script/

ScriptRocket Poll
   PHP4 Script to create web polls. [Commercial]
   http://www.scriptrocket.com/tspoll.php

Szewo Polls
   A complete poll management system written in PHP3.
   http://www.szewo.com/php/polls/eng/

UCCASS - Unit Command Climate Assessment and Survey System
   A PHP based survey maker that's full of features and free under the Affero General Public License.
   http://www.bigredspark.com/survey.html