Big 5

You can add these to your list. Watch Guard, Sonic Wall, Check Point and Symantec makes some enterprise level intrusion detection and vulnerability software.

It all depends on what you are looking for.
access control, authentication, forensics, content management, intrusion detection etc.
Look at the December 2001 issue of Info Security News. They have a list of their picks of 2001. You can gauge some of the vendors names from there.
http://www.scmagazine.com/scmagazine/2001_12/pickof2001/index.html
That link should take you to the article.
Good luck.

Which category please ?? ;-)

A generic answer:

Open Source ===> ;-)
Checkpoint
Internet Security Systems
Symantec
Network Associates

Thanks,
--Rookie

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