SSOX 3.10 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Security Tools, more precisely Personal Security. This free Mac app was originally designed by Avencis. We recommend checking the downloaded files with any free antivirus.
From the developer:
SSOX is an application that allows you to authenticate securely against your company's information system. To enroll this application and associate it with your identity, you must first enter the enrollment parameters provided by the administrator of the solution. Then you will be able to generate OTP (One Time Passwords or dynamic passwords) to connect to a corporate VPN.
You may want to check out more software for Mac, such as SSOX Pro, which might be similar to SSOX.