Material Creation

Here's a little toy that synthesizes a unique terrain texture
by blending a set of base texture layers

Viewer for previewing WAD files (source code only)

A free seamless texture editor

dDo Legacy, free for commercial Use, pre PBR, great texturing tool plugin for Photoshop

Photoshop plugins for normal map creation

Defacto tool for texture management in GoldSrc

Used to lock the z, x and y axis of a sprite.

Simple Interface program to allow the easy editing of the 24 bit Bmp & 32 bit Targas

Put together a sprite from a series of .bmp files

GFX Wad compiler taken from nextwish.org

Skypaint is a legacy program that can view and create skyboxes as well as doing direct edits to them.

Small collection of custom shaders for Source

GUI for the vTex

Paletted images merger for half life

Paint.NET plugin for creating VTF files

Convert images between TGA, BMP and PNG

Useful for locking sprites to Z-axis rotations.

Older tool for creating textures in Quake & HL

Change the version of vtfs without having to hex

Create normals, bumps, AO and other maps from the diffuse for use in games

Create logos/Sprays for Source Games

Convert an Image to a Spray

Toolset and tutorials for creating good GoldSrc materials

Turn images into Decal files (WAD format)

Sprite generator for HL

Converts the contents of WADs into BMPs

This is a simple seamless skybox bitmap generator. It generates
six bitmaps which can be used as the textures on a skybox within
a game engine

Edits and creates WAD files for the game Doom. It's 9 years too late, but better late than never!

Check if your textures tile correctly

VMT Creation Tool

Modified DirectX libraries for a better experience in Half-life 2

Ease the creation of .vmt files as wells as convert Targa files to Valve's Texture Format.

Convert TGA's into a DuDv format, without the need of having Steam to be running

a tool to help manage WAD configurations.

Library for adding VTF support to your own apps

Source Material Manager is an application to manage VTF and VMT files. SMM makes your texture and material editing faster!

utility that converts Wads to TGA's

Half-Life Texture Tools - create and view wad and spr files

Photoshop plugin that creates tiled images for game

Valve Material Type file generator