This open source project licensed under the GPL will thoroughly scrub your system of known threats to any platform. Its database of malware signatures is frequently updated and the system has a number of graphical front ends.

A new native port for Windows is still in the works, but there is already an older unsupported ClamAV for Windows and a ClamWin as well as a ClamXav 2.0 Public Beta that runs under the latest release of OS X for Mac Users.

While the various ClamAV GUI’s tend to produce too much low level feedback on what the tool is doing, the system gets the job done which is what really matters most in this space.

Also see Part 1 & Part 2 of this series.