Team Fortress is a revolutionary class-based mod supporting from 2 to 4 teams in various gameplay modes of capture the flag, capture and hold, and hunted. I will try to fill this profile with as much OFFICIAL TF (no variants/mods) files I can fill.
The VERY FIRST public release of Team Fortress (August 1996)! Includes source code. (Infact it's all there is)
a rare one :) Historical version 1.3, released on Halloween 1996.
This is the Team Fortress 2.8 release, released 5/23/1998
This is the released source code for the 2.5 version of Team Fortress.
This is Team Fortress, version 2.5, released on 6/13/1997.