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LimeSurvey (formerly PHPSurveyor) is an open source application for online survey application, written in PHP and using MySQL, PostgreSQL or MSSQL databases.

Surveys include branching from conditions, templates and custom design using a web template system, and provides basic statistical analysis utilities for the treatment of the results obtained. Surveys can have both public access and strictly controlled access to the tokens that are assigned to each person participating in the survey. In addition the results can be anonymous, separating the data of the participants of the data that they provide, even in controlled surveys.