Team Fortress Classic
The original "Team Fortress" was developed by Robin Walker and John Cook as a free mod for the 1996 PC game "Quake". In 1998, Walker and Cook were employed by Valve, which had just released its first game, "Half-Life." Valve began developing "Team Fortress 2" as a standalone retail game using Valve's GoldSrc engine. In 1999, Valve released "Team Fortress Classic," a port of the original "Team Fortress," as a free "Half-Life" mod. "Team Fortress Classic" was developed using the publicly available "Half-Life" software development kit as an example to the community and industry of its flexibility.