Pivotal - Pivotal Software provides enterprise PaaS-based solutions.
Platypus - Realtime server monitoring and reporting
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.
Monitornator - Server monitoring made simple
Healthy Servers - Making server monitoring easy
NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.