Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
nginx - A high performance free open source web server powering busiest sites on the Internet.
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
vCenter Server - IaaS platform for managing and deploying virtual machines
Google Cloud Functions - A serverless platform for building event-based microservices.