Terminal App -
This app lets you see what each app is about including the calendar app. You can also see you notes and what are in them through this app. Typing help gives the list of commands that you could use as well!

Setting App Update -
The settings app not has multiple different features including changing your color scheme. You can also change the clock from 23 hours to the 12 hours version and also switch on and off sound for the future music app. Finally, you can also reset all your settings if you want a fresh start.