LimeSurvey (formerly PHPSurveyor) is a PHP survey software to create online surveys. Features open/closed surveys, branching, participant administration, quotas, WYSIWYG HTML editor, email invitations & reminders, assessments, basic statistics and more.
Using LimeSurvey it is possible to:
1) Develop surveys (multiple surveys possible);
2) Create a database for collecting survey data;
3) Use one of two different ways for responding to the survey
a) Basic dataentry
b) User friendly web based form
4) Maintain a database of people invited to participate in the survey, and keep a record of who has participated and who has not (if required)
5) Export the survey structure, survey responses and user information for any surveys.
PHP + Microsoft SQL Server, MySQL, PostgreSQL (pgsql)