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GEneric Medical Survey TRACKER is written in PHP, using Zend Framework.
GemsTracker is a tool for tracking fixed sequences of surveys asked to groups of individuals or organizations.
GemsTracker is not a tool for building and administrating surveys. For that specialized survey software packages are used by GemsTracker, with LimeSurvey as the first among equals.
Encuestame is an Open Source Java web application to publish, collect, share and measure the opinion of the people thought the social media or private environments. Private or public surveys, protected by password, widgets embeddable, ready for mobile and multi language
LimeSurvey is a 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.