Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
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.
AWS Amplify - JavaScript library for app development using cloud services
Salesforce Platform - Salesforce Platform is a comprehensive PaaS solution that paves the way for the developers to test, build, and mitigate the issues in the cloud application before the final deployment.