EasyChannel - Simplify your multichannel eCommerce with EasyChannel.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
eDesk - Business Tools, Support, Sales, and Marketing, and Help Desk
tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
Desku.io - Customer support simplified
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.