> Half-Life I think you mean Team Fortress? Although Half-Life does use a modified Quake engine, it was a commercial game that used none of the assets of Quake

> Half-Life I think you mean Team Fortress? Although Half-Life does use a modified Quake engine, it was a commercial game that used none of the assets of Quake, so I don't think calling it a "mod" is really appropriate. (Side note: my username is a Half-Life reference)