The best replacement for sso is rpr.

The best alternatives to sso are rated as following:
★★★★★  rpr
★★★  ldap
★★★  openid
★★  oauth
★★  federation
★★  ssl
★  saml
  single sign on
  iwa
  rsu
  cso
  federated

Your alternative for sso is not listed? Suggest!
Speaking about sso, one probably shouldn't forget about saml.

Other search terms related to sso and their ratings are:
★★★★★ saml
★★★ oauth
spring security
You have in mind a companion for sso and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of sso in all years. Click on graph for more.
sso
rpr
ldap