Solaris Sky Calendar - An astronomy calendar right in your pocket

Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.

Sundial App - Sun & Moon times and alerts for iPhone, iPad, & Apple Watch

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.

Alpenglow - Never miss a incredible looking sunrise or sunset again

Pomodone - Pomodone is the easiest way to track your workflow using Pomodoro technique, on top of your current task management service.