Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
Nanobox - The ideal platform for developers. Focus on code, not config.
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
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.
LiteSpeed Web Server - LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement.
Pivotal - Pivotal Software provides enterprise PaaS-based solutions.