One Month iOS - Learn to build your first iPhone app in just one month
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Sjabloon - Rails SaaS starter kit (just $79 one-time)
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
One Month Python - Learn to build Django apps in just one month.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.