LimeSurvey

LimeSurvey is one of the most mature and feature-rich open-source survey platforms available, with over a decade of development and a global user community. It enables the creation of complex surveys with advanced logic, branching, quotas, and multi-language support — capabilities far beyond what Google Forms offers.

LimeSurvey supports over 28 question types including matrices, ranking, slider, equation, file upload, and geolocation. Surveys can be distributed via direct links, email invitations, or embedded on websites. Respondents can answer anonymously or be tracked, and comprehensive statistics and export tools (Excel, CSV, SPSS) are built in. It also supports LDAP authentication and multi-user access with customizable roles.

Licensed as GPL and with over 3,500 GitHub stars, LimeSurvey is trusted by universities, government agencies, NGOs, and researchers worldwide. It can be self-hosted on PHP/MySQL servers or used as a managed cloud service at limesurvey.org. For anyone needing a professional survey tool with full data sovereignty, LimeSurvey is the gold standard open-source alternative to Google Forms.