Offers fully Internet-based, automated, cross-platform, enterprise security patch management software so IT administrators can assess and resolve security vulnerabilities across operating systems and applications. http://www.patchlink.com
Vulnerability remediation software which prevents networked machines that have been off the network for some time from gaining access until the software has applied necessary patches. Also offer policy management and automatic logoff tools. http://www.citadel.com/
Searchable database of vulnerabilities. Offers data for download in XML format as well as via website. Details of how to submit new vulnerabilities, database schema and FAQ. http://www.osvdb.org/