NationBuilder - The world's first platform for leaders, handcrafted from scratch to help you grow your community and lead them to action.
Flare by GoDaddy - Discover, give feedback and support startup ideas
Crowded Communities - The all-in-one community platform.
Wittycircle - Networking tool for entrepreneurs, makers and curious minds.
vBulletin - Build a community website with the leading forum software, vBulletin 5 Connect, or in the cloud on vB Cloud!
Generating Product Ideas - Find ideas for your next business or side project