Aegis
Aegis is a free, secure and open source 2FA app for Android
Screenshots
Hunter's comment
In general we use Google Authentication app for security, Aegis is best than Google authentication app.
Aegis has lot of additional features. It available in open source too. Available at free of cost.

Adding new entries also very easy, Scan QR CODE, Mannually entry, import files also accept.
This app available in playstore and F-Droid too.
HOTP (RFC 4226), TOTP (RFC 6238), Steam (RF 6238) algorithmm it support.
More details pls visit the website
Link
https://github.com/beemdevelopment/Aegis
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