Personal Calendar - intuitive useable calendar app with many features:

- views: month, week (cells), week (columns), day, year, month/day combination, agenda
- individual event colors; event colors can also be used as background color of a day cell
- color profiles for the whole calendar
- event categories - also useable as template
- copy and paste for events
- powerful rule editor for event recurrences
- event invitations
- weather information
- ics import/export
- supports OpenTasks and Exchange Tasks (Google Tasks isn't supported at the moment)
- ...

HANDLING:

- show, edit and create events by a double-tap
- swipe left/right or up/down (customizable)
- zoom available within day view, month/day combination, column based week view and year view
- drag'n drop within day view, month/day combination and column based week