American Tower Corporation
ATC uses GroupID to allow its company users to access, search, and maintain their directory data and groups via any browser; and improve accuracy of its distribution lists and security groups.
PA Office of Attorney General
PA Attorney General Office uses GroupID to provision/de-provision accounts, manage groups, create directories and manage contact information accurately, with ease and exceptional control.
A book on how to manage AD Groups, aka Active Directory® Group Management For Dummies
Imanami GroupID: Most promising IAM solution provider. A hassle-free active directory group management.