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
Clearbit - Clearbit provides Business Intelligence APIs
LiveChat - LiveChat - premium live chat software. Approach customers directly on the website, make connections and drive more sales using LiveChat.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
Crisp Chat - Multi-channel customer support software
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.