We finally released the first version of Nextcloud Forms – a proper open source alternative to Google Forms, SurveyMonkey, Typeform and the like. 
I’m really excited about this especially because of the improved privacy and control it brings in user research:
And if you want to get involved or have any feedback, please join us at https://github.com/nextcloud/forms/ – thanks a lot to @ei8fdb already for the great input!