Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Brevy (beta) - Give feedback, Google-doc style, directly on your website
Talkus - Chat with your website users from Slack
Flycode - FlyCode (YC S22) makes web apps editable without coding so companies can iterate and release products faster - helping teams edit copy, images, and links in the code so their developers don’t have to.
Drift - A messaging app that helps you grow your business.
Iteration X - Iteration X allows teams to annotate and edit any live website or web app directly in Chrome.