AssaultCube is a free, open-source shooter based on the Cube engine and taking place in realistic environments. It includes single and multi-player, as well as various modes which can be played over a wide range of maps.
Overview of 6 open-source games: Wesnoth, AssaultCube, Hedgewars, Xonotic, Neverball, Warzone 2100.
AssaultCube is a popular cross-platform first-person shooter with pretty low hardware requirements, with a fast gameplay and many modes – including the classic CTF, TDM, FFA, or the popular TOSOK (Team One Shot One Kill), LSS (Last Swiss Standing), or HTF (Hold the Flag).
AssaultCube is a first-person shooter game based on the Cube engine with support for online multiplayer and single player games, with a fast-pace gameplay and entertaining gaming modes. The latest version was released on November 14, 2010 and brings several bug fixes and tweaks.