EzCal is a calendar app with 3 selling points: it has a simple appearance, you can add events quickly, and it is easy to use.
Your calendar is always displayed by the month, so there are no confusing changes between screens. You can add recurring events with one tap, using the Quick Add feature.
A powerful WOL (Wake On Lan) application.
You can launch your Mac/PC from iOS/Android.
(Your computer must support WOL and be properly configured.)
You can also use ping to check the startup.
A little network knowledge is required to use this app.
The OS, BIOS, router, and this app must be configured correctly for it to work.