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
Helpware - Amazing Customer Experiences. Together.
LiveChat - LiveChat - premium live chat software. Approach customers directly on the website, make connections and drive more sales using LiveChat.
HelpSquad - Highly Vetted, Highly Trained chat support and conversion specialists
Crisp Chat - Multi-channel customer support software
DeskMoz - DeskMoz Provides 24x7 Live Chat Agents for Your Website.