Antivirus
Avast
For home, non-commercial use.
Comodo Antivirus
Free for both commercial and personal use.
Panda Cloud Antivirus
For home use and ?non-profit organizations?.
AVG (Anti-Virus Guard)
For home, non-commercial use.
Avira
For home, non-commercial use.
Bit Defender
For home, non-commercial use.
Ad-Aware Free Antivirus+
Lavasoft?s Ad-Aware Free program is 100 percent free for home, non-commercial use ? no strings attached.
Sophos Home
Free version of Sophos Home is for private and non-commercial use, letting you protect up to ten computers per account.
ClamWin
ClamWin Free Antivirus is a free software project.