Clam AntiVirus
Clam AntiVirus is a GPL anti-virus toolkit for UNIX. The main purpose of this software is the integration with mail servers (attachment scanning). The package provides a flexible and scalable multi-threaded daemon, a command line scanner, and a tool for automatic updating via Internet. The programs are based on a shared library distributed with the Clam AntiVirus package, which you can use with your own software. Most importantly, the virus database is kept up to date .
各種バイナリーパッケージも豊富。
http://www.clamav.net/binary.html#pagestart
関連：http://clamwin.sourceforge.net/
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