Facebook - Connect with friends, family and other people you know. Share photos and videos, send messages and get updates.
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Bitrix24 - Bitrix24 is a free (for small businesses) social enterprise platform. It is a united work space which handles the many aspects of daily operations and tasks. Create your own social intranet in minutes!
Bigtent - BigTent is a web-based organization and communication portal for groups.
Disciple - Grow, engage and monetise your community with Disciple community software. Get your own branded community platform on Web, iOS and Android
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.