avast! antivirus software is based on the ALWIL Software virus scanning technology since 1988. avast! antivirus engine scans for computer viruses, worms and Trojans. It can be used to scan any object you like - files, memory, E-mails, Web sites etc. Users can select the right Edition of avast! antivirus.

Sophos's software and appliances protect business networks against viruses, spyware, adware, Trojans, spam, and unwanted applications.

Trend Micro is a global leader in network antivirus and internet content security software and services with focus on outbreak prevention and enabling customers to manage the impact of network worms and virus threats.

McAfee, Inc, the leader in intrusion prevention and security risk management, proactively secures systems, and networks, worldwide.