I playthrough the single player campaign of Quake with the Team Fortress mod, one of the most influential mods ever made.
You can download Team Fortress for Quake by visiting the following website (I’m using version 2.8):
I’m running Quake with the DarkPlaces source port. Download the latest version here:
And, of course, you’ll need a copy of Quake in order to play Team Fortress. Quake can be found on Steam.