The Weapon Workshop
If there's anything you need to know about HL, go to this site. Your premiere source for all HL related.
One of the lonely site dedicated to weapons and SP models for HL. Check it out!
The Number 1 quality models ressource for HL. The models that are accepted are usually the best. Now has an SP section (too bad I skin and not model :])
Black Widow Games
The homepage of the author of the single player mods 'USS Darkstar' and 'They Hunger' series. I use many of TH's skins, so it's kinda like a ressources site ;-).
V.S.S.E. Clan
The VSSE clan (Vital Situation, Swift Execution) is a clan of model skinners and modellers for HL. I espicially like their chromed skins.
This is the site of a friend of mine. He helps me with some of my models in animations. The site will have more stuff in it as more people will come.
Half-Park
Use this button to link to my site: (temporary button)
Polycount's HL model section slowly grows. They have a section of map models, I.E models for mapper to put in their maps.
The other Half
A single-player HL modification that focuses on what happens after Gordon accepted the G-man offer. The mod authors are friends of mine and the story sounds preety good for now.
BRMF Gazette
The Black Mesa Research Fascility Gazette aims to bring you the hottest and latest news of what's happening in the fascility. The site updates perriodicly so you better check it once in a while if you wanna know the top stories.
Sven Co-op is a modification that allows co-operative multiplayer (where players fight together against monsters/etc.) in Half-Life. It also adds some features like new monsters and weapons to make co-op play more interesting.