We used to have multiplayer mods everywhere. San Andreas, Vice City, GTA 3, GTA IV, Just Cause 2, Just Cause 3, Far Cry, Half Life 1 & 2, Turok, Crysis.....list goes on.

I know they take an incredible amount of work, and are very difficult to make, but we had it good for a long long time. fondly miss the multiplayer mod/client era of gaming.