Source SDK

Source SDK is a collection of programs, including a map editor, for designing maps and modifications for games that use Valve's Source engine.

Utilities

 * Create a Mod
 * Refresh SDK Content
 * Reset Game Configurations
 * Edit Game Configurations

There are also a number of smaller "hidden" applications. Most of these are command-line based and are used to process elements such as textures and models. These include Vtex (a compiler to turn TGA images into usable materials) and bspzip (a program to collect all items used in a level into a single file). Information on these are available at the Valve Developer Community.

Engine versions
The Source SDK also currently has two options to choose from via Engine type. A user can choose the newest version of Source, or the previous version (HL2 - Episode 1). The current differences is modified compiler and custom programs featured below. Some of the many command line programs have also been improved. The newest version of Source offers Particle Simulation effects alongside many of the other improvements made to it.

Face Poser
Face Poser is the tool used to access facial animations and choreography systems.

This tool allows one to:
 * Edit facial expressions, gestures and movements for characters (which are called actors), allowing one to mix or blend several expressions on the fly.
 * Lip synch speech with the speech the characters use (and blend the speech with other facial expressions). The phonemes used for lip-synching can be extracted from existing spoken .wav files, the tool taking care of the real-time association between the spoken phonemes and the movements of the lips.
 * Sequence expressions and other acting cues and preview what the scene will look like in the game engine. A scene can refer to multiple actors and thus can be used to block out fairly complicated interactions and dialogue between game characters.

Model Viewer
The Model Viewer is a program that allows users to view models.

The Model Viewer can be used for a variety of different purposes, including developing. Developers may use the program to view models and their corresponding animations, attachment points, bones, and so on. It can also be used to view props, weapons, buildings, and just about any other 3D object found except something which is a brush (an object created in Hammer that makes up the actual world - something like a floor, wall, room, skybox or terrain), the Model Viewer can't view game textures either (Hammer is used for that purpose instead).

Full List of SDK Applications

 * bspzip
 * demoinfo
 * glview
 * Hammer
 * height2normal
 * height2ssbump
 * hlfaceposer
 * Model Viewer
 * motionmapper
 * qc_eyes
 * SDKLauncher
 * shadercompile
 * studiomdl
 * vbsp
 * vconfig
 * vrad
 * vtex
 * vtf2tga
 * vvis
 * xwad