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.
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
NodeChef - NodeChef provides managed hosting for Node.js and MongoDB apps.
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
Render - Render is a unified platform to build and run all your apps and websites with free SSL, a global CDN, private networks and auto deploys from Git.
Google Cloud Functions - A serverless platform for building event-based microservices.