WoltLab Suite is described as 'PHP-based CMS built for forums and community building' and is an app in the Development category. There are more than 100 alternatives to WoltLab Suite for a variety of platforms, including Online / Web-based, Self-Hosted solutions, Windows, SaaS and Linux. The best alternative is Discourse. It's not free, so if you're looking for a free alternative, you could try Google Drive - Forms or Flarum. Other great apps like WoltLab Suite are phpBB (Free, Open Source), Simple Machines Forum (Free, Open Source), UseResponse (Paid) and Microsoft Forms (Free).
Unlike the most others solutions, SurveyJS Project consists of three fully independent parts: run-time SurveyJS library, SurveyJS editor and SurveyJS service for storing and analyzing results. You may stick with the complete solution or use only a library.
OhMyForm is a free and open source alternative to commercial form creators like Typeform and Google Drive - Forms providing all the features you need to run, administer, analyze and distribute forms for free.