Turtle Arena is a free and open source cross-platform third-person action game using a modified version of ioquake3. Turtle Arena is multiplayer oriented with multiple game modes and can be played over a network, splitscreen, and with AI player bots.
The video is of a Turtle Arena 0.5.0 Capture the Flag game with bot players. The level is named Subway. Turtle Arena is available for download at http://turtlearena.com.
Music: "Whispering Wind" by zero-project.gr (CC-BY-SA-3.0)
Art/sound by ZTurtleMan (CC-BY-SA-3.0) / OpenArena (GPLv2+)