Free scanners for Linux:
Avira: Avira AntiVir PersonalEdition Classic
AVG ( Grisoft) AVG Anti-Virus Free Edition for Linux
Avast: avast! Linux Home Edition
F-Prot: F-PROT Antivirus for Linux Workstations
ClamAV:Clam AntiVirus
Some of the products are designed as GUI desktop scanners, should also function on servers with GUI.