LimeSurvey

LimeSurvey is a free, open-source survey tool with self-hosted and cloud options. It offers unlimited surveys and responses, plus advanced logic, question randomization, and custom templates. A large community provides plugins and translations. LimeSurvey suits organizations or researchers wanting full control over survey data with on-prem hosting, extensive customization, and no per-response fees, but who can handle moderate technical setup.