McAfee's GroupShield and GroupScan (includes AIX)
Trend Micro's ScanMail for Lotus Notes (includes AIX support)
Group-WG's WatchDog
Cheyenne's InnocuLAN for Notes
Symantec's Norton Antivirus for Notes (includes Unix, AS/400 and S/390; Linux soon)
Command AntiVirus for Lotus Notes
Panda AntiVirus for Lotus Notes
Sophos Mail Monitor
Die Avast! Domino Edition
Kaspersky AntiVirus (includes Linux)
ESET's NOD32 for Lotus Domino