The Assassin 3D is designed exclusively for swift killing in a high-speed gaming environment. First, the Assassin 3D trackball provides quick and direct aiming. For example, spinning the ball 90 degrees makes an exact 90-degree turn in your game.
Tag: free look
Panther XL: The First 3D Combat Controller
The Panther XL allows the player to "Free-Look" totally independent of the direction of travel. With this independent control you can run one direction and fire in another without breaking stride. You can also "slide" around corners with your gun always aimed in front of you, ready for anything. John Romero, Co-creator of Quake, famously said, "If you wanna crack skulls with the big boys, get a Panther XL."
Donde Quake 2? 