UseResponse - Open-source, self-hosted customer feedback software, live chat and helpdesk system that you can install on your server. Organize documentation using knowledge base and get feedback from social networks with centralized system
HubSpot - Grow Better With HubSpot: Software that's powerful, not overpowering. Seamlessly connect your data, teams, and customers on one CRM platform that grows with your business.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Spectate.com - Watch Your Leads Grow with Content Marketing
Olark - Real-time chat and monitoring of your website visitors through Google Talk and Jabber.
Techiterian SocialMail - Email & Social Media Automation Online Tool