Malwarebytes Anti-Malware, Avast Free Antivirus, Clam AntiVirus, HitmanPro, Windows Security, Kaspersky AntiVirus, AVG AntiVirus, Avira Antivirus, Bitdefender Antivirus, ESET NOD32 Antivirus, Panda Dome, Comodo Internet Security are some alternatives to Avast One.