Founders Nation - Find or become a startup cofounder
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
CoFoundersLab - Meet 250,000+ entrepreneurs online
wikiHow - wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual.
Findnlink - Find people to work with on your ideas.
Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.