"Half-Life: Day One" This was the first official demo of Half-Life, including "The first day" playing time.

A demo for Half-Life 1

Half-Life, voted game of the year in 1998. Counter-Strike, one of the world's popular online action game. What would happened if you were to merge both of these? Simple, you would have a mod with Half-Life's storyline with Counter-Strike's weapons and hence, Counter-Life is born.

Pulse is a MOD for Half-Life 1. Pulse takes place in Black Mesa after the incident. You are famous scientist Gordon Freeman. In the beginning of Pulse, you are in Surface Lab A Security Complex, a lab and security station on the absolute surface of the Black Mesa Research Facility. You are working with your scientist pals when one scientist working with a hazardous radiation meter detects high radiation amounts coming from all over. They radio into the Administrator's office, the office of Dr. Wallace Breen. Instead of Breen answering, they pick up a remote conversation between Breen and an unknown voice. "It's done," Breen said. "The xenian crystal triggered a dementional rift between Earth and the boarderworld Xen. Now let's get to the surface!" "I'm sure my employers will be pleased," says the unknown voice, and then silence fills the room followed by an explosion. The other scientists are amazed that the Administrator of Black Mesa himself would work with someone to trigger such a disaster and are trying to turn Breen in to the Special Projects Executive, the overseers of the Black Mesa Research Facility. The only way to get the S.P.E. to believe them is to get Dr. Breen's special operations profile from his office and hand it over to the S.P.E. as evidence. The scientists, however, are terrified of entering Black Mesa after a resonance cascade saying it is too dangerous. Gordon Freeman volunteers to go into Black Mesa, retrieve Breen's Administrative profile and bring him to justice.

demonstration of the puzzles in the Pulse mod

Zombie Panic is a multiplayer mod for the original Half-Life. One player starts off as a zombie. Every time he kills a human survivor, that player becomes a zombie as well. The team behind Zombie Panic is currently working on a Half-Life 2 version and you can find out more about it by visiting www.zombiepanic.org.

Paranoia - a total conversion singleplayer modification for Half-Life (GoldSrc engine). You will play the role of a russian officer of the secret service. Your first impressions are that this mission will be just like any other, but you really have no idea what nightmares future events have in store for you...

Team Fortress features a wide variety of character classes, advanced user-interface system (V-GUI), new networking and server technologies, new scenarios, and spectator modes.

Create a whole new world for Half-Life!. This release introduces several new features such as an OpenGL renderer, new texture application features, automatic previewing tools, and more.

Natural Selection is a Half-Life modificiation that blends first-person combat with real-time strategy. It features intense 'marines vs. aliens' teamplay, where one marine can become Commander. The Commander plays from a top-down perspective and leads live players.