Even though 254 players were taken in the 2013 NFL Draft, they aren't the only ones who will get a chance to make an NFL roster this fall. Every team signs numerous undrafted free agents following the festivities in New York. As history has shown, more than a fair share of these UDFAs not only play in the NFL, but enjoy long and productive careers. In fact, a select few have already been inducted into the Pro Football Hall of Fame with the possibility of more to come.

Undrafted free agents are signing all over the NFL, and some stars in the league do slip through the scouting cracks from time to time. Could Chris Polk, Chase Minnifield, Dwight Jones or William Vlachos be that next surprise? Here’s a look at some big-time players who earned it the hard way. Our list begins in 1987, so you will not see greats like Dick “Night Train” Lane, Warren Moon or Willie Wood.