Utilities

Tools for aiding in the creation of animations for view player models

Compression tool used to create small files that can be transmitted by servers to gamers

This is an all-in-one kit that comes with both Hammer 3.4 and 3.5, Auto Seamer, Batch Compiler, BSP Viewer, BSP2MAP, Crafty, GCF Scape, Leak Marker, MAP Viewer, Model Viewer, PAK Explorer, Revolver, Sprite Explorer, Sprite Fixer, Sprite Viewer, Sprite Wizard, Terrain Generator, Texture Extractor, Valve Compile Tools, Wally, WinBSPC, and ZHLT.

With Captioneer you can easily create your own Closed Captions for Source-based Games, like for Team Fortress 2.

Miscellaneous programs which use Steam data

An assortment of java classes for working with the source engine

A collection of tools and libraries for the Source Engine on the Xbox 360

Defacto tool for extracting content from steam archives

Simple movie recording tool for Source Engine games

This is a set of scripts that make VMPI workers easier, vmpi is used for network distributed map compiling

Source Engine Scripting and Administration

OpenGL wrapper for Direct3D

Manages custom content for steam games

Benchmark which introduced some of the new and more advanced features of the Source engine and Valve's hybrid threading technology

WAD Compiler

Sublime Text filter system that searches the Valve wiki for the input text

GUI frontend for BZIP2

Sound editing tool, useful for looping by adding cues

Workshop tools for creating Nightfire content

A collection of tools to help with modding

Collection of simple icons for Source related content (This version is from Riintouge)

Content installer for some source games

A utility that automatically generates a formatted .kv file based on your selection.

Valve Integrated Development Environment

Large collection of all the typical tools used in Modding

extract gcfs

Development environment for Garrys mod Lua files

Automatically makes a blank mod!

simple command line program that converts v13 packed addons to v12

This simple script in batch add a button in the windows context menu for create files in VPK format

hlds (goldsrc) logs parser written in C#

This is a simple interpreter library for the Source Config.

Half-Life Launch Pad is an application to ease the process of loading mods and maps for Source and GoldSource.

FGD highlighting for Sublime Text editor

Edit the UI colors in Worldcraft

Collection of icons for valve games

OmniToolz is a tweaker made for all games out there!

Valve Source Engine game language resource file localization tool

Source Sauce is a replacement out-of-game utility for the in-game options menu of Source Games.

Launch mods for Half-Life

Extract the contents of VPK files

Render smoother Source Engine videos, faster.

Source Multi-Tool is meant as a replacement to Valves Source SDK Launcher

Simple movie recording tool for Source Engine games

Resguy is similar to RESgen and FLRGen, but can find all content that Sven Co-op maps are allowed to customize and only includes what is required

High definition pack for Half-Life and Opposing Force

This new render dll's support transparent models in many new MOD's.

Javascript parser for valve gui files -- ported from optf2's vgui.py

Free and open source SDK launcher for Counter-Strike: Global Offensive and other source engine games

A PoC library for working with the VConsole network protocol.

Allows console commands to be sent to source-engine games (hl2.exe). Works with text-mode clients.

Source Engine based Project Cleaner - Primarily for SDK 2013 to make certain files more Linux & Mac friendly.

This is a C# library to manage GoldSrc specific files.

Launcher tool for Half-Life

netdecode is a utility for parsing and analysing data within demo files produced by Valve's Source engine (only the Orange Box branch for now). This is primarily a tool for testing and reference. Poorly written in C#.

TF2 demo parsing in javascript

A metamod plugin that allows you to write server side plugins with C# on the GoldSrc engine

Valve Data File Parsing library.

AMD dropped opengl support at one stage for their drivers and this helps rectify the issue

a tool for game replays recorded with Half-Life.

This Project aims to provide a parser which parses the log output of the goldsrc hlds engine (Counter-Strike, Half-Life, etc.). There is a parser written with ragel and one written by hand.

This tools manages your custom modifications for your Source based Steam games.

PackBSP is a tool to help automatically manage and pack dependencies in custom maps for games

Spreadsheet listing HL2 models

An ambitious attempt at providing a WYSIWYG HUD editor for Source based games

An assortment of java programs for working with the source engine

selection of icons for Valve filetypes making development on windows easier

For working with the same data Steam relies on