The Linux Documentation Project is working
towards developing free, high quality documentation for the Linux operating
system. The overall goal of the LDP is to collaborate in all of the issues
of Linux documentation.
Centrify.com: Active Directory-based auditing, access control, and identity management for your UNIX, Linux, Mac OS, Java and web platforms from Centrify
Centrify's auditing, access control and identity management solutions enable organizations to centrally secure their heterogeneous systems, web applications, databases and storage systems using Microsoft Active Directory.