Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Surfly - Simple, Fast, and Secure Co-browsing
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
DivShow - Extremely easy way to build product walkthroughs on your web pages!
Crisp Chat - Multi-channel customer support software
Copointer.com - Copointer is technology for co-browsing on your website, that will help to improve your customer support and to be on the same page with your client.