Today it’s multiplayer mods.
PK had such an air of quality about it you’d be excused for thinking it was a commercial product. I would go as far as to say that this is the de facto deathmatch experience. Get the bots here.
You can find the mod here, “dme11.zip” is what you want. DME mostly adds extra animations to the game so now you can see what weapon you are using reflected on the player model. You can also crouch. They claim that it runs on a 8MB machine so if you are seriously RAM deficient you can still play Quake with this mod.
You can find the mod here, “horror.zip” specifically. It’s a chainsaw wielding maniac or a Shambler against a team of weenies. When I saw that Friday 13th game I had an instant flashback to this except this is super basic.
You can find the mod here, “soccer3.zip” was the version I played. Unfortunately this isn’t the one where you kick a head around and shoot off your guns. It does have bots, bots that don’t have no game plan but bots all the same.