The best replacement for global catalog is ldap.

The best alternatives to global catalog are rated as following:
★★★★★  ldap
★★★  infrastructure master
★★  schema master
★★  domain controller
★  universal group caching
  non global catalog

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No companions for global catalog have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of global catalog in all years. Click on graph for more.
global catalog
ldap
infrastructure master