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Alwill Software produces Avast 4Home, which is a free version of their AV for home users.
Grisoft's AVG is still free.
Softwin also has a free AV called BitDefender (previously known as Anti Virus eXpert or AVX).
Personal use of Anti Vir is also free.
Free F-Prot for DOS uses the same definition file as the Windows version. It can be run in command-line mode on Windows.