Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
NationBuilder - The world's first platform for leaders, handcrafted from scratch to help you grow your community and lead them to action.
Bigtent - BigTent is a web-based organization and communication portal for groups.
Crowded Communities - The all-in-one community platform.
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.
Ning - Ning is the social platform for the worlds interests and passions online.