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Model
From Quake Wiki
Models are 3D meshes used for Quake's monsters, weapons, items, etc. In Quake they use the .mdl file format.
The original models were created in PowerAnimator. They are/were sometimes referred to as "Alias Models" which seems to originate from this. Probably to differentiate between "BSP models" like the ammo pickups and the "alias models".
The textures for the models were created in [Deluxe Paint|http://en.wikipedia.org/wiki/Deluxe_Paint].
TODO
Models are both the mdl and the bsp ones, aren't they? --Spirit (talk)
Sources
http://forums.insideqc.com/viewtopic.php?f=13&t=5676
http://www.gamers.org/dEngine/quake/QDP/makemodels.html
http://www.gamers.org/dEngine/quake/spec/quake-spec34/qkspec_5.htm
http://www.insideqc.com/qip/q1/qfix.htm