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.
This is Team Fortress, version 2.5, released on 6/13/1997.
This is the Team Fortress 2.8 release, released 5/23/1998
a rare one :) Historical version 1.3, released on Halloween 1996.
The VERY FIRST public release of Team Fortress (August 1996)! Includes source code. (Infact it's all there is)
This is the released source code for the 2.5 version of Team Fortress.