Carrd - Simple, responsive one-page site creator.
Live Chat by Sumo.com - Instantly communicate with customers, prospects & visitors
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
GetChat.App - Add WhatsApp chat to your website for free
Video Live Chat for Websites - Provide real-time video chat support with screen sharing
mmm.page - Dead simple, drag & drop personal websites