Sophos is a very well regarded security related company and have (IMO) a excellent product for enterprises servers:

https://www.sophos.com/en-us/products/server-security.aspx

And, also for home users (for free):

https://www.sophos.com/en-us/products/free-tools/sophos-antivirus-for-linux.aspx
https://www.sophos.com/en-us/products/free-tools.aspx