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vBulletin - Build a community website with the leading forum software, vBulletin 5 Connect, or in the cloud on vB Cloud!
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
Froged - One click solution providing easy-to-use marketing, sales and support services to turn website visitors into happy customers.
XenForo - Intuitive. Social. Engaging. Fast. XenForo brings a fresh outlook to forum software.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.