9. Simple Calendar Widget
Regardless of how you manage your appointments, being able to see them at a glance on your home screen goes a long way. The native Android calendar widget leaves something to be desired (as do most native widgets added in by phone manufacturers), but fear not: There are plenty of excellent alternatives available.
My favorite is the aptly named Simple Calendar Widget. The free app gives you a simple, scrollable list of your upcoming events and is completely customizable so you can make it look exactly the way you want.
The widget is available in a variety of sizes and can be placed on your lock screen, too, if you have a device with Android 4.2 or higher.