AskBot - Askbot enables users to create Q&A forums.
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.
Question2Answer - A Q&A site helps an online community to share knowledge.
wikiHow - wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual.
Scoold - An open-source, enterprise-friendly Q&A platform inspired by Stack Overflow.