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- Quest's Quest Authentication Services
- Likewise Likewise Enterprise or Likewise Open + Likewise UID-GID Module
- Centrify's Centrify Direct Control
Distinctions
Ability to perform Host management functions (pushing cross-platform group policy objects; system inventory/configuration registry) in addition to perform user sync. Quest and Centrify seem to offer that, I don't see that Likewise has that capability. Centrify has a "zoning feature" which allowed delegating administration and user management.
