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

ClamWin Free Antivirus is a free software project.
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