Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.
Simple Poll - The easiest way to create polls in Slack
wikiHow - wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual.
Twitter Polls - Polls embedded in tweets
AllAnswered - Your Team's Collective Brain All-In-One Knowledge Management System Wiki + Q&A + Workflow + AI
doopoll - Create live, instant, editable polls effortlessly