What alternatives for reporting OSX Server Web Stats do the same job as AWStats?
Sawmill -- http://www.sawmill.net
Advanced Web Stats -- http://www.advancedwebstats.com/

These are the only ones that I could find and recommend, since Urchin and Summary were discontinued.
Links/Resources

http://www.sitepoint.com/forums/showthread.php?250463-Best-Mac-Server-Web-Stats-Software
http://sixrevisions.com/usabilityaccessibility/10-promising-free-web-analytics-tools/

This link details 10 great Web Stats Tools (For instance, Snoop is a Mac OS Desktop Application).