If your cat gets bored at home with the standard toys that sit on the floor and collect dust, you may want to put your computer in front of your computer and play an interactive website for your cat. By visiting this website, you can pick an animated cartoon character to display on your screen such as a bee or a bird. Then this animation moves on the screen, hopefully tempting your cat to swat at the screen to get at it.
This can be amusing for your cat and for you. Of course, this means that you just bought a computer strictly for your cat to play with, but at least your cat can get some exercise and you can take a break from the computer.