Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Google Calendar - Spend less time managing your day & more time enjoying it
Shippable - Add continuous integration and deployment to your GitHub repositories in a few minutes.
Business Calendar - Powerful and easy to use calendar app for Android including weather, widgets and tasks.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Jorte - Schedule books must be practical and has a good design.