Apps similar to HENNGE OTP Generator include Bitwarden Authenticator, which is free and open source. Other options are 2FA Authenticator (2FAS), Authy, Google Authenticator and Authenticator Extension. There's no shortage of Authenticators like HENNGE OTP Generator, with more than 25 alternatives for iPhone, Android, iPad, Mac and the web.
Two-step verification app with offline code generation, HOTP and TOTP support, biometric login, local auto backup, QR and image import, multi-language interface, account personalization, dark mode, label grouping, and data privacy controls for secure management.
India
Token2 mobile application can be used with Token2 service, or any other TOTP and Mobile-OTP compliant service with additional features such as possibility of PIN code protection for TOTP profiles and QR code based enrollment for Mobile-OTP profiles.
Switzerland
A simple application for multi-factor authentication, written in HTML using jQuery Mobile, jsSHA, LocalStorage and Application Cache. It implements the TOTP (Time-Based One-Time Password) algorithm according to RFC6238 and has been tested to work with Google Authenticator...
