LimeSurvey
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LimeSurvey (formerly PHPSurveyor) is a free and open source on-line survey application, distributed under the GNU General Public License. As a web server-based software it enables users to develop and publish on-line surveys, and collect responses, without doing any programming.
Surveys can either be publicly accessible or be strictly controlled through the use of "once-only" tokens, granted only to selected participants. Additionally, participants can be anonymous, or LimeSurvey can track the IP addresses of the participants. LimeSurvey also provides basic statistical and graphical analysis of survey results.
A more detailed listing of features can be found on LimeSurvey.
LimeSurvey is written in PHP. It is cross-platform and cross-database (MariaDB, Mysql, PostgreSQL, Sqlite, MSSQL).