ClamAV

ClamAV è un ottimo antivirus freeware, open source per sistemi operativi Linux e Unix. Tra le features principali: command-line scanner, fast, multi-threaded daemon, milter interface for sendmail, database updater with support for digital signatures, virus scanner C library, on-access scanning (Linux and FreeBSD), detection of over 20000 viruses, worms and trojans, built-in support for RAR (2.0), Zip, Gzip, Bzip2, built-in support for Mbox, Maildir and raw mail files.