Limesurvey is the number one open-source survey software. Github: https://github.com/LimeSurvey/LimeSurveyWebsite: https://www.limesurvey.org
Tag archives: services
BookStack
A platform to create documentation/wiki content Github: https://github.com/BookStackApp/BookStackWebsite: https://www.bookstackapp.com
awesome-console-services
A curated list of awesome console services (reachable via HTTP, HTTPS and other network protocols) Github: https://github.com/chubin/awesome-console-services