An offline calendar without any other calendar integration. You can easily create recurring events and setup reminders it can also display week numbers.

Contains a resizable 4x4 widget where you can customize the color of the text as well as the alpha and the color of the background.

Contains no ads or unnecessary permissions. It is fully opensource provides customizable colors.

The Storage permission is needed only for exporting or importing events from .ics files.

This app is just one piece of a bigger series of apps. You can find the rest of them at http://www.simplemobiletools.com