Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
usql - Universal command-line interface for SQL databases
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.
Open PostgreSQL Monitoring - Oversee and Manage Your PostgreSQL Servers
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.
Errbit - The open source error catcher that's Airbrake API compliant