What are some alternatives?
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
SnapEngage - SnapEngage live chat helps you to sell better and help your customer more effectively with both live chat and screen captures.
LiveAgent - Live chat software with the right portion of helpdesk functionality. Ticketing, Livechat, Reports. Hosted or On-Premise. Starting at $15. FREE 14 day trial.
Olark - Real-time chat and monitoring of your website visitors through Google Talk and Jabber.
Salesforce Service Cloud - Service Cloud integrates customer service with social networks and provides a self-service customer portal and knowledge base system.
Zopim by Zendesk - Live Chat