Cube2 is a networked 3D first-person shooter game engine. It supports modern graphic effects and conveys a sense of fast-paced oldschool gameplay. The game client also works as the map editor. It is even possible to create and edit a map together with other people over a network connection.
The effects of Cube2 might be considered unsuitable for children.
The Debian package cube2-data contains several maps, one player model, textures and sounds and thus provides a playable demo to demonstrate the capabilities of the Cube2 engine.