Yodeck - Yodeck enables you to design and schedule your digital signage on Raspberry Pi easily from the web, using your computer, tablet or smartphone.
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
OptiSigns - OptiSigns Digital Signage is a platform that helps users to make any screen a digital sign for information or advertisement.
andOTP - andOTP is a two-factor authentication App for Android 4.4+
Xibo - Digital Signage for Everyone!
Microsoft Authenticator - One app to quickly and securely verify your identity online, for all of your accounts.