Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
CoinFalcon - Buy and sell bitcoin, litecoin, ethereum and iota with ease.
Microsoft Authenticator - One app to quickly and securely verify your identity online, for all of your accounts.
Coinflash - Automatically invest your spare change into cryptocurrency.
andOTP - andOTP is a two-factor authentication App for Android 4.4+
Coinbase - Bitcoin, safe and easy.