AssaultCube is a free, multiplayer, first-person shooter game, based on the CUBE engine.
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Pro In-game level editor with support for realtime multiplayer editing
Admins of a server can enter edit mode for a map during gameplay, updating components of the map live without needing to run other software or develop any code or image assets.
Pro Variety of fun game modes
Pro Minimal resource usage
AssaultCube is extremely fast, small, and network efficient for an FPS game.
Pro Has a decent number of community servers
Pro Fast-paced multiplayer FPS gameplay
AssaultCube does a good job of adding fun, fast paced shooter gameplay (like in Counter Strike) to the open source world.
Pro Cross platform support
AssaultCube runs on Windows, Mac, and Linux.
Con Outdated graphics
Based off the original Cube engine, which has dated quite a bit.
Con Lack of gameplay refinement
AssaultCube does not have that many weapons (though they do have some variety). Additionally, the game is not very balanced, as spawn points are sometimes in vision of other enemy spawn points.