Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
Higher Logic - Private, secure online communities that stimulate conversation and ignite engagement.
Zoho Desk - Industry's first context-aware Helpdesk Software
Tribe.so - Tribe is a white-label platform, empowering the new generation of online communities.
Salesforce Service Cloud - Service Cloud integrates customer service with social networks and provides a self-service customer portal and knowledge base system.
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.