Modifications and Add-Ons

Bullseye Crosshairs
Has many crosshairs that replace games default sniper one.
http://www.bullseyecrosshairs.com/hlsites4.shtm

Chicken Mod Plug-In
Allows admin to change a player into a chicken.
http://djeyl.net/chickenmod.php?language=english

Condition Zero
Single player modification which allows control of a squad on specialized missions.
http://www.cs-conditionzero.com/

Counter strike 1.6 U.K
Includes skins, wallpaper, sprays, hints, tips and Counter-Strike lingo.
http://www.freewebs.com/smoz/

Counter-Strike Blood
A rare and free add-on file to increase the blood in Counter-Strike.
http://www.geocities.com/japanfaq3/cs-blood.html

EZ-Binder
A tool to easily bind commands for Counter-Strike's Warcraft 3 modifications, without having to bring up the console.
http://ezbinder.awardspace.com/

Slackillers Mapping
Counter-strike gaming, Half-Life mod textures, mapping, models, and outlaws mod.
http://www.slackiller.com/

SuperCow
Focusing on map creation, offers forums, downloads, screenshots and tutorials.
http://www.angelfire.com/ut2/supercow/