Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Google Calendar - Spend less time managing your day & more time enjoying it
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
Jorte - Schedule books must be practical and has a good design.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
Business Calendar - Powerful and easy to use calendar app for Android including weather, widgets and tasks.