FEITIAN OTP Authentication Server (FOAS)

https://www.ftsafe.com/products/OTP/OTP_Server

Thales /Gemalto SafeNet Authentication Service (SAS)

https://cpl.thalesgroup.com/access-management/authentication-as-a-service/sas-pce-safenet-authentication-service-pce

Thales /Gemalto Confirm Authentication Server (CAS)

https://www.thalesgroup.com/en/markets/digital-identity-and-security/banking-payment/digital-banking/authentication-server

Thales /Gemalto Confirm Authentication Server (CAS) Brochure

https://www.thalesgroup.com/sites/default/files/database/document/2021-02/fs-authentication-server.pdf

DS3 Authentication Server

https://www-356.ibm.com/partnerworld/gsd/showimage.do?id=36901