Connect to your other devices using a secure private network, without the complications of firewalls and port forwarding slowing down your progress. A great tool to remotely fix problems on others devices and it is very user friendly.
Available as a desktop app, web client and for iPhone and android.
https://www.teamviewer.com/en/download/mobile-apps/
As android manufacturers have a lot more variance in terms of battery and energy drain I find this app useful for working out how long my phone will take to charge.
https://play.google.com/store/apps/details?id=com.abmantis.galaxychargingcurrent.free&hl=en_GB
Create wallets for lesser known crypto currencies or alt-coins and trade instantly between them and with other wallets. Price charts and exchange rates are shown as well as the security features you would expect from services such as Coinbase.
https://play.google.com/store/apps/details?id=mw.org.freewallet.app
https://itunes.apple.com/app/id1274003898
A highly configurable home screen customizer. Want more apps on one screen? Want less apps on one screen? All this and a whole host of other options await. No root access needed!
https://play.google.com/store/apps/details?id=com.teslacoilsw.launcher&hl=en
Discover which apps are using which permissions and turn them on and off as you see fit. Root access may be required.
https://play.google.com/store/apps/details?id=com.findsdk.apppermission&hl=en_GB
https://play.google.com/store/apps/details?id=com.zinio.mobile.android.reader&hl=en
https://itunes.apple.com/us/app/zinio-magazine-newsstand/id364297166?mt=8
This game might teef a lot of your time and battery but it’s a great tower-defence styled game set in the fallout world with similar mechanics to the console/pc versions without overcomplicating things. Addictive AF.