Toolkit for UNIX systems released under GPL. Provides a scanning daemon intended primarily for mailserver integration, command line scanner for on-demand scanning, and update tool.

Antivirus software package targeted at business customers

Makers of popular Norton Antivirus product.

Anti-virus and anti-intrusion software designed for both home and corporate users.

Produces the McAfee VirusScan line of antivirus software, as well as various specialized products for home and business users. Also offers managed security services for home and business users.

Developer of anti-virus, anti-spyware, anti-spam and personal firewall products. Includes downloadable trial versions.

Offers anti-virus and internet security software. Site include product information, support facilities, and trial version downloads.

Free Windows antivirus software, licensed under GPL with open source code. Project information, screenshots, download, news, and user guide.

avast! complete anti virus protection for all computers with a fast incremental update. Several versions available Home, Professional, Network, Enterprise, Groupware, and Firewall edition.

Provides antivirus software for home and business users, with firewall and antispam options also available.