Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
MAMP - MAMP is the abbreviation for Macintosh, Apache, MySQL, and PHP. It is a reliable application with its four components that allows you to access the local PHP server as well as the database server (SQL).
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.
Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
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.
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies