Utilities

Extract the contents of VPK files

Checks for errors in your map

Valve Source Engine game language resource file localization tool

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

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

Drop items (vpk you want to extract or folders you want to convert to vpk) onto the App Icon

Render smoother Source Engine videos, faster.

fixes 'bad inline model number #, worldmodel not yet setup' errors

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

Manages custom content for steam games

Tool for porting your GoldSource maps to Source. It features many fixes that will save hours of mindless work.

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

Windows gadget for the source sdk

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

A PoC library for working with the VConsole network protocol.

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.

Very useful tool when working with faceposer and creating dialog

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

Easily recreate your gui elements in other languages

HLLib is a package library for Half-Life that abstracts several package formats

Simple movie recording tool for Source Engine games

WebGL app that renders levels from the Source Engine, created against Team Fortress 2 resources. The Source Engine and anything related to it is the property of Valve Software, who does not authorize or endorse this project in any way.

selection of icons for Valve filetypes making development on windows easier

Valve Data File Parsing library.

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

For working with the same data Steam relies on

simple command line program that converts v13 packed addons to v12

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

RESGen. A tool to create .res files for Half-Life.

The second release of 007 Nightfire's PC modding tools originally released many years ago including Gearcraft, Model Compiler, Map Decompiler and more.

This tool was manly made to extract out the mapname of GoldSrc- and Source Engine demofiles and place it in the name of the demofile itself.

OpenGL wrapper for Direct3D

a collection of tools to enrich GoldSrc

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

Defacto tool for extracting content from steam archives

VOGL is a debugger for the OpenGL rendering API intended to be used in the development of video games

Source and GoldSrc Query Tool

Valves VR toolkit for the HTC Vive

Tool to aid in the creation of WAV files

Large collection of all the typical tools used in Modding

This is a simple interpreter library for the Source Config.

Source Engine Scripting and Administration

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

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

Just extract this somewhere and drag your demo file onto it and it'll remove all the scoreboards and command menus from demos.

Launcher tool for Half-Life

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

C# library for reading/parsing & writing demo files produced by GoldSource (HL1) and Source-engine (HL2) based games

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

Miscellaneous programs which use Steam data

Valve Integrated Development Environment

GUI frontend for BZIP2

Development environment for Garrys mod Lua files

HLViewer is a simple to use javascript library for viewing maps and playing replays of GoldSrc engine based games entirely in browser

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

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

Spreadsheet listing HL2 models

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

High definition pack for Half-Life and Opposing Force

Half-Life 1 Scripting and Administration

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

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

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

Tools which can decompress and compress Nightfire's .007 archives.

Alternative to Resgen, Download at own risk

Silence unwanted and annoying game sounds. (Half-life goldscr engine)

Collection of loaders for game engine asset types. Currently supported: Half-Life BSP, MDL and SPR. (requires compilation)

An assortment of java classes for working with the source engine