The best replacement for ntlm is kerberos.

The best alternatives to ntlm are rated as following:
★★★★★  kerberos
★★★★★  basic authentication
★★★★  ntlmv2
★★  ldap
★★  negotiate
★  kerberos sharepoint
★  lm
★  kerberos authentication
★  basic
★  windows authentication
★  kerberos sharepoint 2013
★  ntlmssp
★  lm hash
★  kerberos sql server
★  saml
★  lanman
★  spnego
★  kerberos iis
  windows wcf
  kerberos sharepoint 2010

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Google Trends

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ntlm
kerberos
basic authentication