Disciple - Grow, engage and monetise your community with Disciple community software. Get your own branded community platform on Web, iOS and Android
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Forumotion.com - Create a free forum : free forum hosting, free forum skins, templates editing, chatbox, RPG mod... Choose PhpBB 2 - 3, Invision or PunBB. Create forums now!
HelpDocs - Educate your users with a super simple knowledge base that’s built for teams just like yours.
Proboards - ProBoards is a host of free forums with customer service.
ScribeHow - Create step-by-step user guides, with a simple click