- AVG Free – Download antivirus and antispyware software for Windows – The free version of Grisoft's anti-virus and anti-spyware programs, for personal use with Windows or Linux.free.avg.com
- Spybot-Search & Destroy –
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Comodo Internet Security – Free Version – Comodo Internet Security is the free, multi-layered security application that keeps hackers out and personal information in.
Built from the ground upwards with your security in mind, CIS offers 360° protection by combining powerful Antivirus protection, an enterprise class packet filtering firewall, and an advanced host intrusion prevention system called Defense+.
Unlike the stripped down versions of commercial software that other software vendors offer for free, this is the full, completely functional version of the product.