LiveChat - LiveChat - premium live chat software. Approach customers directly on the website, make connections and drive more sales using LiveChat.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
HelpScout - Help Scout is a simple, straightforward way to provide excellent support
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
GoSquared Live Chat - Beautiful, simple, and free live chat for your website
Olark - Real-time chat and monitoring of your website visitors through Google Talk and Jabber.