For writers, serious fans, and anyone looking to win a trivia competition, Pro Football Reference is a must-bookmark site. This is a website where you can track every player to wear a number and cross-reference it with the absurdly powerful player comparison finder.
There is also a version of the Sports Reference brand for every major sport, including college. This isn’t necessarily relevant to me, as I don’t follow any other sports closely, but you can knock yourselves out.
Something odd that PFRef tracks is nicknames. This was first brought to my attention by APC’s own Paul Noonan, when he asked twitter who on the Green Bay Packers is known as “The Freak”.