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.
Stellarium - Stellarium is a free open source planetarium for your computer.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Sky Guide - A window to the stars has never been more beautiful and easy to use.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
SkyView - SkyView is powerful, easy-to-use app that answers questions about stars, constellations, and more.