Gunman Chronicles is a cult-classic science-fiction FPS, released in 2000 on the PC, developed on Half-Life 1's GoldSource Engine. Set in the far future, where mankind's space empire is defended by the Gunman military corps, you take the role of Major Archer in a fight against an old nemesis and a sinister alien species. It also sported a great multiplayer component that once had a thriving community behind it, before the WON servers were shut down in 2005. With a lengthy singleplayer campaign that includes innovative features such as complex weapon modding systems, as well as vehicular combat, and a unique art style combining steampunk sensibilities with cyberpunk tones and space western influences, Gunman represents, even today, a breath of fresh air in a genre that is slowly growing stale.
Originally a mere mod with a protracted development schedule, it eventually turned into a full retail release following an impressive showing at the Half-Life Mod Expo in 1999. Ever since its original release, Valve has still owned the rights to it, but for whatever reason has neglected to release it on Steam, leaving it to be forgotten. All of Valve's other back catalog games have been re-released on Steam... except for Gunman. The game itself is now practically out-of-print, and acquiring a copy can be difficult.
We hope that with enough people joining this group and supporting our cause, Valve may notice and develop some interest in resurrecting the Gunman legend on Steam. We're confident that a Steam re-release, even in this day and age, would be a success, especially within the Valve fanbase.