Day by Day Organizer - Time management app that combines Google Calendar and Google Tasks and enhances their features.
FamCal - FamCal is an organized and managed calendar to track the family records like events, notes, and dates of births.
Calendar Lock PEA - Calendar Lock PEA is an encrypted desktop calendar with a day, week and month view. The shown calendars are never stored unencrypted on your disk, but exist only in the RAM. Platform-independent, Open Source, no installation or registration required.
Power Planner - Record homework and class schedule.
Business Calendar - Powerful and easy to use calendar app for Android including weather, widgets and tasks.
Dreamie Planner - Dreamie Planner app contains a built-in diary through which users can write important details about their daily tasks and can send the content of the diary to their friends and colleagues.