SendBird - SendBird is messaging-as-a-service.
Heroku - Agile deployment platform for Ruby, Node.js, Clojure, Java, Python, and Scala. Setup takes only minutes and deploys are instant through git. Leave tedious server maintenance to Heroku and focus on your code.
Chat by Stream - Build and ship in app messaging in a few hours
8base - Rethink development using 8base's low-code development platform.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Porter - Heroku that runs in your own cloud