Amazon AWS - Amazon Web Services offers reliable, scalable, and inexpensive cloud computing services. Free to join, pay only for what you use.
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
DigitalOcean - Simplifying cloud hosting. Deploy an SSD cloud server in 55 seconds.
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
Softlayer - Softlayer is the cloud computing platform that offers the services of computing, networking, storage security, and application development.
Google Cloud Functions - A serverless platform for building event-based microservices.