Level Creation

It is another type of solid which is perfect for creating terrain. A plugin for Hammer

GUI Compiler for Half-Life Maps

This tool can help you by grouping the map into VisGroups based on a grid.

Quake Army Knife, multi-purpose tool for games based on or similar to the Quake engine

Preview a map contained in a BSP file.

Frontend wrapper for netvis

A nice tool made in 2015 which can come in handy sometimes when a bsp file is too large and wont work in BSPtoMAP.exe

Alternative to Hammer

Generate a random map for Half-Life based on criteria you set in the application

Creates .Res files for Source games running on a server

This program is a little tool for those that like the Half-Life game, with
its amazing kind of enemies and weapons.

A small VMF to JSON parser

Convert .BSP files to .MAP files & Extract files from .PAK or .SIN files

Analyzes and reports on errors in the map compilation process

A tool for tweaking hammer settings and using multiple texture profiles

A GUI tool for embedding custom content

This is a tool for showing leaks in a map made in WordCraft.

this will pack every custom item into your map up to and including map over views

Generate mazes for your level in GoldSrc

Generates Terrain for Games

Custom DLL that supports transparency in Half-Life for Steam

A small collection of FGD's for Source

A graphical interface for creating and editing Half-Life FGD Files.

Optimizes the entities in compiled maps, allowing you to include more entities and also reduce network traffic.

Map viewer for Valve's GoldSrc engine (needs to be compiled)

Tools to aid in creation of HDR Targa files (command line)

This tool is used to create the smallest convex brush containing all points in the input file. Input file can be .smd (use its vertexes), .map (brushes and point entities) or .pts file.

This tool blocks Hammer from converting plane coordinates to integers when exporting .map file and thus enables Hammer to output the original floating point coordinates.

Preview a map contained in a BSP file.

Standalone Compiler for GoldSrc Maps

Multi Game Map Editor that supports Half-life

Standalone Compiler for Source Maps

Update to ZHLT

Collection of the main tools required for mapping with GoldSrc

The open source, cross platform level editor for idtech games (GTKRadiant fork)

The Official Editor for Valve Games

Map Resource Extractor (MRE) is a small program that reads the VMF, and only copies the content that has been used in the map.

Custom DLL that supports transparency in Half-Life for pre Steam WON

Create a Map using color information through 2D

Tool for compiling Maps from hammer

Adjust the light levels in a map

Batch map compiler for GoldSrc

The Calliper editor (formerly Crowbar) is designed to be a cross-platform, extensible level editor that accelerates the creation of computer game maps, and is targeted specifically at Source engine games.

Entspy is program for viewing and editing the entities of compiled map

Free, Opensource, drop-in editor replacement for Hammer

List Maker automatically generates your maplist.txt and mapcycle.txt, it can be further used for making lists outside of Maplist making.

Lists maps for easy maplist.txt

Generate forests within your maps based on surface type

Older free for personal use version of Terragen for sculpting landscapes

Decrypt files that have been protected with BSPProtect (commandline)

Allows you to create interesting 3D shapes without going through all the hassle of vertex manipulation

Crafty is a 3D object, material, model and file browsing utility for Source & GoldSrc Maps.

Batch compiler for automating Map Compilation

Inserts instances into a map

Quake2/3 map surface generator

BSP2OBJ is a command-line utility capable of converting Quake, Quake 2 and Half-Life map files into OBJ meshes

Generates displacements that would usually take an extremely long time, or just be impossible to do in Hammer.

fixes the annoying Navigation Mesh was built using a different version of this map

Valve Map Extractor, Decompile BSP maps for source (original version)

Collection of various bspconv exes i have found around the net

ZHLT rebuilt and up to date with latest engine build

This program adds custom content to a BSP. It is a GUI version of Valve's bspzip.

VSIF2VCD is a command line scenes.image extractor/decompiler.

Some Dev Texture guides to aid with level creation

Simple tool for converting world units into Hammer Units

DirectX based application to open and view Half Life 1 game files (Source Code)

a 3D Shape Generator for the Quake & Half-Life Map Format

This is a tool I made to create huge forests in Source maps (It should work with any source game!)

Simple tool to dump raw data from Valve's map files.

Small prefab to help protect your map

Another great tool from RedMser which tracks Hammers compilation progress even when it seems to hang

The open source, cross platform level editor for id Tech games.

A tool to assist in the compiling of source engine maps

Batch files for killing the compile processes

Hack the colors in WorldCraft

Simplest Pak extractor ever. Just pick a map and click the button

Great little command line tool for creating a backup of your map during the compile process

Windows interface that frontends the compiling utilities

Worldcraft Hammer Editor Map Compiler is a set of .bat files that make the process of compiling and developing .bsp maps from .vmf files an easy and fun task.

OGLE is a rather amazing 3d tool that can extract shapes from 3d scenes being rendered on a computer screen