Cliengo - Cliengo is a Chatbot platform that converts the website visitors into qualified leads.
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
GoSquared - GoSquared Real-Time Web Analytics. See who's reading, commenting, joining, or buying on your website right now. Watch your traffic unfold.
Pure Chat - Pure Chat provides FREE live website support and sales chat without the hassle! It's web site chat, simplified.
Olark - Real-time chat and monitoring of your website visitors through Google Talk and Jabber.
Crisp Chat - Multi-channel customer support software