WhosDown - App where you can genuinely make friends—connecting with someone that shares a common interest
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Speciface - Instant access to contact information of people nearby
Bigtent - BigTent is a web-based organization and communication portal for groups.
Coffee Meets Bagel - Each week there are thousands of new couples who find each other through Coffee Meets Bagel! Find your Everything Bagel today.
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.