Aqua Real

At first glance, it's not obvious what separates this screensaver from the variety of others that temporarily turn computers into digital aquariums. Graphics and sound are good, but not eyebrow-raising. Spend a few moments with the program and the differences quickly become obvious, however.

There is a level of interactivity here that few rivals offer: the fish can be touched, prompting the animals to shy away and try to avoid contact. The animals can be fed, enticing them back. The program is highly customizable, allowing users to choose fish species and set quantities, sounds, colors, and a number of other parameters. If you're a fish lover, but have become bored with run-of-the-mill aquarium screensavers, this program may spark your interest anew.