Quake 2 Scene Builder
- View models and skins, and pose them for scenes. Screenshots and gallery.
- http://www.planetquake.com/qsb/

KrAy-ZeE's Modeling Guide
- Guide to making models and skins. FAQ available.
- http://www.planetquake.com/modeling/

Tread 3D
- Map editing program. Downloads, manual, and preview.
- http://www.planetquake.com/tread/

Q2Java
- Information on coding mods in Java. Documentation and downloads.
- http://www.planetquake.com/q2java/

Jitspoe's Joint
- Tips and tutorials on Quake 2 editing, along with a few downloads.
- http://www.planetquake.com/jitspoe/

QuakeLab 2
- Information on getting started in Quake2 level design, as well as advanced topics and downloadable examples.
- http://www.planetquake.com/quakelab/quakelab2/

QERadiant
- Free Quake II map editor that is based on id's own QE4. Includes tutorials and tips.
- http://www.qeradiant.com/