Kaspersky Lab is a Russian computer security company, co-founded by Natalia Kaspersky and Eugene Kaspersky in 1997, offering anti-virus, anti-spyware, anti-spam, and anti-intrusion products.

ZoneAlarm is a personal firewall software application originally developed by Zone Labs, which was acquired in March 2004 by Check Point.

BitDefender is an antivirus software suite developed by Romania-based software company SOFTWIN. It was launched in November 2001

The BitDefender products feature antivirus and antispyware, personal firewall, privacy control, user control and backup for corporate and home users. PC Tuneup and Performance Optimizer are available in the Total Security Suite.