GetJar
Amazon Appstore
F-Droid
Aptoide
SlideME
AndroidPIT
AppBrain
1Mobile Market
Authenticator Plus
andOTP
Aegis Authenticator
OTP Auth
Authenticator
TOTP Authenticator
Tofu Authenticator
OTPClient
GetJarGetJar is recommended for tech-savvy Android users who enjoy discovering new or lesser-known apps, and those who are comfortable evaluating the security of third-party application sources.
Amazon Appstore - The Amazon Appstore is a place to purchase and download apps for your Android device.
andOTP - andOTP is a two-factor authentication App for Android 4.4+
F-Droid - F-Droid is an interesting alternative for Android users who want to try something different and not have to use the Goole Play store all the time.
Aegis Authenticator - Aegis Authenticator is a free, secure and open source app to manage your 2-step verification tokens...
Aptoide - Aptoide is a third party replacement for the traditional Google Play Store.
OTP Auth - The app for calculating one-time-passwords on iPhone and iPad.