Of course most viable options will have been picked up long ago. Here are a few who I think may have some value but you would have to be going really deep. Risky pick ups at best....
QB - Jay Fiedler, Kordell Stewart, Anthony Wright
WR - Marty Booker, Justin Gage, Charles Lee, Michael Lewis, Mushin Muhammed, Az Zahir Hakim, Bethel Johnson, Marcus Robinson
RB - Brock Forsey
TE- Antonio Gates
I wouldnt recommend any of them as such but some of them may be worth looking at and stashing away if you have the roster space and are REALLY desperate. They are guys who I have pondered over though lately.