Sharing the complete list of Anti-Virus is impossible, so just sharing the top 10 free anti-virus list, hope its helpful.
Avira (Windows, Mac)
Bitdefender (Windows)
Avast (Windows, Mac)
AVG (Windows, Mac)
Lavasoft Ad-Aware Free (Windows)
eScan Anti-Virus Toolkit (Windows)
Trend Micro HouseCall (Windows, Mac)
Malwarebytes Anti-Malware (Windows, Mac)
Panda Free Anti-Virus (Windows)
ZoneAlarm Free Anti-Virus (Windows)