Valve Hammer Editor 3.4
The main tool you need to
start mapping.

VERC Collective

Valve Hammer Editor 3.5
The beta version of the new hammer.
The main additions are--
added model rendering in the 3D view
added pointfile viewing to the 3D view

More info found here

Jed's Half-Life Model Viewer 1.3
added features... Wireframe overlay,View eye position,Polygon counter to the sub-models menu,sequence controls to Weapon Origin view,Sexy new icon! Proper installer/Uninstaller

Jed's Half-Life Model Viewer

Sprite Mage
Used to lock the z, x and y axis of a sprite.It's written in german so you'll have to figure it out.

No Homepage found

Zoner's Half-Life Tools
2.5.3 Custom Build 1.7
You need these tools to compile your map.Use these.
Newer versions: ZHLT 3.4 final or the 64 bit version
ZHLT 3.4 final 64

Info can be found here

Sprite Explorer
Tool used to create,view sprites.
can also be used to
view/open .pak files.

Wrench Software

Sprite Fixer
This tool allows you to modify sprites behaviour,
as in you can lock it on its Z axis, so it only
rotates horizontally, or you can lock it
completely

No Homepage found

Sprite Wizard
You can use this tool to
make your own sprites.
pretty easy to use.

Sprite Wizard Tutorials

Sprite Viewer
A tool used to view sprites

MachIII site.

RESGEN 110
This will make a list of all the
resources that your map uses.

Look here to see how to use it.

Mapviewer v1.0.0
Designed for fast previewing of
.map files.Has several rendering
options. A useful tool.

Nem's Tools

Auto-Seamer V 1.0.1
This tool takes an ordinary texture and provides you with three little algorithms to seam it.

Nem's Tools

Darkulator
Will allow you to adjust the light levels in the map.

Botmans

Tutorial Builder
Used to build and publish tutorials.

By James Denny

Nem's GCFScape v1.6.3 full
Need a file buried inside the Steam GCF files
Than this is the tool you need to extract them.

Nem's Tools

BSPtwoMap
Another map decompiler.....
Do not use this program to steal maps. This is used to see how entity work is done in a map.

Zipster

Wally
Need to make a wad, use wally

Wally Homepage

Batch Compiler 3.1.2

Compile your levels using this instead of
Hammer. Less of a resource hog and you
are able to select many of the compiling options
just by clicking a box

Click here to download