The best replacement for adfs is dirsync.

The best alternatives to adfs are rated as following:
★★★★★  dirsync
★★★★  saml
★★★★  pingfederate
★★★★  okta
★★★  domain trust
★★★  onelogin
★★★  forest trust
★★  fim
★  wif
★  cas
★  password sync
  siteminder

Your alternative for adfs is not listed? Suggest!
Speaking about adfs, one probably shouldn't forget about office 365.

Other search terms related to adfs and their ratings are:
★★★★★ office 365
★★★ saml
★★★ azure
★★ saml 2.0
★★ salesforce
★ wildcard certificate
adlds
dirsync
You have in mind a companion for adfs and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of adfs in all years. Click on graph for more.
adfs
dirsync
saml