Idealist - Volunteer, work, and intern job search
Flare by GoDaddy - Discover, give feedback and support startup ideas
OpenVC - 2200+ VC firms by thesis to find 'best fit' for your startup
Wittycircle - Networking tool for entrepreneurs, makers and curious minds.
Requests for Startups - A place to discover ideas that VCs & angels want to fund
Generating Product Ideas - Find ideas for your next business or side project