Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Invision Community - Invision Community is a flexible, integrated set of apps for building communities on the web.
Bigtent - BigTent is a web-based organization and communication portal for groups.
XenForo - Intuitive. Social. Engaging. Fast. XenForo brings a fresh outlook to forum software.
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.
NationBuilder - The world's first platform for leaders, handcrafted from scratch to help you grow your community and lead them to action.