Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Touco - Toucan is a small portableapp utility allowing you to synchronise, backup and secure your data with...
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Mondly - Learn 33 languages in 500 bite-size lessons and 14 conversational modules.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.