The best open source alternative to SurveyMonkey is Nextcloud Forms, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to SurveyMonkey and 14 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to SurveyMonkey are SurveyJS (Free Personal, Open Source), Nextcloud Polls (Free, Open Source), OhMyForm (Free, Open Source) and LiquidFeedback (Free, Open Source).
It's a free, open source web application without any restrictions on usage or application. a. the webapp - this is where you create, design, publish and administer surveys, webforms, and questionnaires b.
LimeSurvey (formerly PHPSurveyor) is an Open Source PHP web application to develop, publish and collect responses to online & offline surveys. Anonymous and Not-Anonymous survey, open and closed group of participant surveys, optional public registration for surveys.
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LimeSurvey vs SurveyMonkey opinions
This alternative is disputed. LimeSurvey is still a legitimate alternative to SurveyMonkey, but it might have issues that some users think are important.