Vidiwise - 1-click video calls based on your visitor's journey, free
Live Chat by Sumo.com - Instantly communicate with customers, prospects & visitors
Bonjoro - Send personal video messages to delight & convert customers
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Closer - Digitize your sales team | Video calls for sales
GoSquared Live Chat - Beautiful, simple, and free live chat for your website