What was OpenAthens SP
OpenAthens SP, or OASP, was the SAML compliant Service Provider software we offered from 2012 to 2020. It used a central web interface to define how it worked so that publishers didn’t have to delve into XML files themselves.
It was replaced by Keystone, introduced as Cloud SP in 2017. Keystone uses OpenID Connect at the SP end for a simpler implementation across more platforms and provides a simpler way to participate in SAML federations as well as supporting 1:1 connections for B2B sales.
Keystone Docs: OpenAthens Keystone
Marketing site: https://www.openathens.net/publishers/