Citrix Online

Logging into Citrix Gotomeeting payment services and noticed a familiar login screen.

Looks like Citrixonline.com uses Spring and CAS as per the j_spring_cas_security_check login parameter:

https://login.citrixonline.com/login?service=service=https%3A%2F%2Fsecure.citrixonline.com%2Fcommerce%2Fj_spring_cas_security_check