Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
ScreenTray - A better way to capture, annotate and share screenshots
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
Marker.io for Slack - Turn screenshots into Slack messages ✌️
Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.
Weava - Workspace to highlight, organize & collaborate on your research articles.