Utilities

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

Create cues in WAV sound files

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

PakRat is a graphical replacement for the BSPZIP program

Launcher tool for Half-Life

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

Demo files to benchmark Half-Life 2

Makes starting Source based game server as easy as possible

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.

benchmarking tool for Linux OpenGL games

A GUI for both VTEX and studiomdl.

Manages custom content for steam games

Valves VR toolkit for the HTC Vive

Valve Source Engine game language resource file localization tool

A half life dedicated server (goldsrc) management tool written in ruby

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

Generate RES files for your maps

hlds (goldsrc) logs parser written in C#

simple command line program that converts v13 packed addons to v12

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

Notepad++ syntax highlighting for Valve files

Windows gadget for the source sdk

Pak Explorer is a tool to help view and edit the contents of Qukae II PAK files

Vice is Valve's tool for ICE encryption, a trick used mainly to protect weapon script files from modification by server admins.

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

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

Development environment for Garrys mod Lua files

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

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

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

a tool for game replays recorded with Half-Life.

An NPM package for manipulating FGD (Forge Game Data) files.

Render smoother Source Engine videos, faster.

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

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

You scan for the maps., Then select the map. There you go. Just right there at your desktop

A development integration and project building tool for Source Engine modders.

Workshop tools for creating Nightfire content

Add thumbnail support for VTF files in windows

PiLauncher lists the mods installed on your favourite games to make them easy to launch

Edit the UI colors in Worldcraft

extract gcfs

Tool to aid in the creation of WAV files

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

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

OpenGL wrapper for Direct3D

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

Miscellaneous programs which use Steam data

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

WAD Compiler

FGD highlighting for Sublime Text editor

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

Launch mods for Half-Life

This is a simple interpreter library for the Source Config.

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

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

a free open source tool that can be used for tuning and cleaning up Steam and Source engine games.

Adds TGA Thumbnails in windows

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

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

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

This is a pixel shader for bloom-like effects on any Half-Life engine game.

Source and GoldSrc Query Tool

Large collection of all the typical tools used in Modding

A collection of tools to help with modding

Simple movie recording tool for Source Engine games