Utilities

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

Add thumbnail support for VTF files in windows

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

Windows gadget for the source sdk

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

Manages custom content for steam games

Notepad++ syntax highlighting for Valve files

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

FGD highlighting for Sublime Text editor

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

Valve Source Engine game language resource file localization tool

Debug options for HL2 Deathmatch

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

Ctx converter removes the hassle of having to type in correct cmd commands to decompile ctx files

vdfplus is a small library that aims to help with converting Valve's KeyValue format to JSON and vice versa.

Large collection of all the typical tools used in Modding

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.

Valve Integrated Development Environment

selection of icons for Valve filetypes making development on windows easier

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

Very useful tool when working with faceposer and creating dialog

Source Engine Scripting and Administration

Valve Data File Parsing library.

GUI frontend for BZIP2

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

Edit the UI colors in Worldcraft

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

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

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

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

Launch mods for Half-Life

A collection of tools to help with modding

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.

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

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

Content installer for some source games

Miscellaneous programs which use Steam data

Adds TGA Thumbnails in windows

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

WAD Compiler

Tool (Utility) for generating .res files for GoldSource .bsp engine maps

Generate RES files for your maps

Valves VR toolkit for the HTC Vive

Workshop tools for creating Nightfire content

OmniToolz is a tweaker made for all games out there!

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

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

extract gcfs

This is a simple interpreter library for the Source Config.

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

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

Makes starting Source based game server as easy as possible

benchmarking tool for Linux OpenGL games

Extract the contents of VPK files

a tool for game replays recorded with Half-Life.

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

An assortment of java classes for working with the source engine

Extract content from game archive files

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

Great little tool for adding VMF associations to specific Hammer Versions

Here are compiled versions of some of the tools from the source sdk released on 12/1/2004.

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

Collection of icons for valve games

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

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

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

Documentation for the goldsrc sdk entities