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.
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.