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In July 2016, Avast acquired competitor AVG Technologies for $1.3 billion. https://www.avast.com/ Bitdefender Antivirus Free : It's a free antivirus software and developed by Bitdefender . Its headquarters is located at Bucharest , Romania . https://www.bitdefender.com/solutions/free.html Kaspersky Security Cloud - Free : It is a free antivirus and developed by Kaspersky Lab .