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.

UserEngage is a Real-Time Customer and User Engagement Tool for Big and for Small Businesses, designed for maximizing the conversion.

Crisp is a customer messaging software.

Mibew Messenger is an open-source live support application written in PHP and MySQL.

Kayako is a customer service software.

Visitlead Live Chat is a live chat software for websites.