GreenRADIUS OATH Module add-on
Self-registration portal for easy enablement of Google Authenticator (and other similar apps, such as Microsoft Authenticator, Authy, and FreeOTP)
The Initiative for Open Authentication (OATH) is a reference architecture for interoperable strong authentication across all users and devices.
Based on open standards, OATH support has been built into a large array of devices and services on the market today. Its open standards and royalty-free specification has led to a large number of tokens, both hardware-based and software-based, all interoperable with the standard.