We haven’t had much UDFA standouts on OL and CBs. But for all-time undrafted, I’d go with
QB Jake Delhomme
RB Pierre Thomas
RB Chris Ivory
WR Lance Moore (1st reg season NFL team)
WR Rashid Shaheed
TE Juwan Johnson
TE Boo Williams
DE Junior Galette
DE Carl Granderson
DT Elex Price
DT Shy Tuttle
LB Sam Mills (1st reg season NFL team)
LB Vaughan Johnson (1st NFL team/non-main draft)
LB Keith Mitchell
CB Delvin Breaux (1st NFL team)
CB Ken Crawley
S Sammy Knight
S Brett Maxie
K Garrett Hartley (1st reg season NFL team)
P Blake Gillikin
Edit: Breaux for Brian Dixon