Day by Day Organizer - Time management app that combines Google Calendar and Google Tasks and enhances their features.

Google Calendar - Spend less time managing your day & more time enjoying it

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.

Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...

Business Calendar - Powerful and easy to use calendar app for Android including weather, widgets and tasks.

Morgen.so - All-in-one Calendar, Tasks & Scheduler. Morgen is the single hub for everything that revolves around time management.