Cortana - Cortana is your personal assistant.
Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
Hound - Your code, always in style. Hound comments on style violations in GitHub pull requests, allowing you and your team to better review and maintain a clean codebase.
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
Slant.co - Slant is a collaboratively edited resource that helps you quickly make decisions.
Askalot - Askalot is a next generation CQA (Community Question and Answer) system.