Clam AntiVirus is a GPL anti-virus toolkit for UNIX (and OS/2). 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. A multithread plugin for InetPowerServer is available, ask for details (not free software).
Latest stable build for OS/2 is version 0.96.2, currently available downloads:
The status of current source integration can be followed here on ClamAV bugtracker.