Modeling

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It has been suggested that this article or section be moved to Modeling Resources. (Discuss)

Utilities

MDL Texture Info (http://www.wunderboy.org/3d_games/utils/sourcetools.php#mdl_tex)
A console utility that lists all the materials used in a MDL.
MDLDecompiler (http://www.chaosincarnate.net/cannonfodder/mdldecompiler.php)
Breaks MDL files down to their component parts.
VTFTool (http://www.wunderboy.org/3d_games/utils/sourcetools.php#vtftool)
A tool to convert TGA to VTF, and back again.
Photoshop VTF Plugin (http://nemesis.thewavelength.net/index.php?c=154#p154)
A plugin for photoshop that can both open and save VTF files.

Resources

CDG.net Community (http://www.cdg.net/)
A great resource for learning about, downloading and releasing models.