Most of these are well-known freebies for Windows, but who knows, you might find a gem.

http://www.teknobites.com/2007/07/19/20-op...s-apps-for-you/

http://www.teknobites.com/2007/09/08/40-fr...s-apps-for-you/

A more comprehensive list - http://osswin.sourceforge.net/

Also see:
http://en.wikipedia.org/wiki/List_of_free_software

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