Advice Request Which security software vendors have their own antivirus engine?

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Here's a list of many of them.
  • 360 (Qihoo)
  • AhnLab
  • Avast/AVG
  • Avira
  • Bitdefender
  • Bkav
  • CHOMAR
  • Comodo
  • CMC
  • Dr.Web
  • ESET
  • Huorong
  • K7
  • Kaspersky
  • Malwarebytes
  • Malware Hunter (Glarysoft)
  • Max Secure
  • McAfee
  • NANO
  • Net Protector
  • Padvish
  • Panda
  • Quick Heal
  • Reason
  • Rising
  • Smadav
  • Symantec (Norton)
  • Tencent (uses Bitdefender signatures as well as their own)
  • Trend Micro
  • Webroot
  • WiseVector
  • Zillya