Since we are talking about tools for Quake, here's a new release of
Milkshape 3D. You can create and edit models for games such as: Quake (all serie), Half-life, Unreal tournament and much more (milkshape support 27 games for models creations, you can view the list
here). The software can be downloaded as a shareware, available for a trial version of 30 days. The new version has a lot of things to offer to modelers.