Popular games built on game engine GoldSrc

Dr. Gordon Freeman doesn't speak, but he's got a helluva story to tell. This first-person roller-coaster initiated a new era in the history of action games by combining engrossing gameplay, upgraded graphics, ingenious level design and a revolutionary story that may not be all that it seems, told not through cutscenes, but through the visual environment.

Cry of Fear is a single-player, horror modification for Half-Life 1 that brings you all the horrors you have always been afraid of. This is a free total converstion of Half-Life 1, which means none of the assets from Half-Life 1 have been used in this mod or any files from other people, it is a totally unique experience. Everything is made exclusively by Team Psykskallar, the Cry of Fear developers.

Play the world's number 1 online action game. Engage in an incredibly realistic brand of terrorist warfare in this wildly popular team-based game. Ally with teammates to complete strategic missions. Take out enemy sites. Rescue hostages. Your role affects your team's success. Your team's success affects your role.

Sven Co-op is a co-operative game originally based around Valve Software's Half-Life. In this game players must work together against computer controlled enemies and solve puzzles as a team.

Half-Life: Uplink is a demo version of Valve's 1998 first-person shooter computer game Half-Life. Uplink features many of the common enemies, characters, and weapons from the full game, but unlike the first Half-Life demo and the Half-Life 2 demo, the location and scenario in this demonstration do not appear in Half-Life. The Uplink chapters were cut during Half-Life's development phase and roughly fit in prior to or during the Lambda Core chapter; they were, however, strongly revised for the demo release. Uplink also includes the same Hazard Course from the full release of Half-Life. It was also included on "Official PlayStation Magazine Disc 57" as a bonus unlock if you entered a cheat into the PS2 version of Half-Life and swapped the discs.

Originally, Gunman Chronicles was developed by Rewolf Software as a mod for the first person shooter Half Life; after negotiations Sierra released it as a retail version in 2000. In Gunman Chronicles, the general of the Gunmen fell in battle with the Xenomes, a strange alien species which suddenly appeared on the planet Banzure Prime. Now, a mysterious presence has tinkered with the DNA of these Xenomes, making them bigger and stronger than ever before, and the scourge is spreading once again. As Major Archer, leader of the Gunmen, the only law in this area of the galaxy, you must set things right - find the source of this hostile invasion, and clear these alien scum from the rim of the galaxy!

Enlist in an intense brand of Axis vs. Allied teamplay set in the WWII European Theatre of Operations. Players assume the role of light/assault/heavy infantry, sniper or machine-gunner class, each with a unique arsenal of historical weaponry at their disposal. Missions are based on key historical operations. And, as war rages, players must work together with their squad to accomplish a variety of mission-specific objectives.

With its extensive Tour of Duty campaign, a near-limitless number of skirmish modes, updates and new content for Counter-Strike's award-winning multiplayer game play, plus over 12 bonus single player missions, Counter-Strike: Condition Zero is a tremendous offering of single and multiplayer content.

Enjoy fast-paced multiplayer gaming with Deathmatch Classic. Valve's tribute to the work of id software, DMC invites players to grab their rocket launchers and put their reflexes to the test in a collection of futuristic settings.

One of the most popular online action games of all time, Team Fortress Classic features over nine character classes -- from Medic to Spy to Demolition Man -- enlisted in a unique style of online team warfare. Each character class possesses unique weapons, items, and abilities, as teams compete online in a variety of game play modes.

A futuristic action game that challenges your agility as well as your aim, Ricochet features one-on-one and team matches played in a variety of futuristic battle arenas.

The Wastes is an open world multiplayer FPS taking place in a post apocalyptic world.

For the first time on Steam, Nexon is making a slice of Counter-Strike history available to everyone! Classic Counter-Strike action, new modes, new guns, new characters, Free to Play—what else are we missing? That’s right, Zombies! We welcome you to do your part in cutting down the undead masses. You’ll find plenty of Zombies there in both PvP and PvE flavors.

Counter-Strike Neo is a Japanese arcade adaptation of Counter-Strike, the original Half-Life multiplayer modification. It was published by Namco and runs on a Linux system. The game features unique maps, factions, and settings, though the gameplay and the weapon lineups remain the same as other Counter-Strike games, only with a huge difference in visuals.

Counter-Strike Online is a first-person shooter video game, targeted towards Asia's gaming market released in 2008. It is based on Counter-Strike and was developed by Nexon with oversight from license-holder Valve. It uses a micropayment model that is managed by a custom version of Steam.

Natural Selection is a change of the video game Half-Life. The concept is a mix of first-person shooter and real-time strategy game genres. The game was made by Charlie "Flayra" Cleveland, who later founded the company Unknown Worlds Entertainment. Natural Selection v1 was publicly released on Halloween 2002 for the first time and is now on version 3.2. Natural Selection 2 was released in autumn 2012.