OneAuth 4.3.3 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The application lies within Security Tools, more precisely Personal Security. The actual developer of this free software for Mac is Zoho Corporation.
From the developer:
OneAuth is a comprehensive authenticator app that simplifies all your multi-factor authentication needs and improves your business security. It secures your Zoho accounts and any web app or mobile app which is compatible with time-based OTP verification with two-factor authentication. The OneAuth app offers easy and multiple recovery options.
You may want to check out more Mac applications, such as MozyHome, PassDirector or JonDo, which might be similar to OneAuth.