Are you trying to live greener, but little indiscretions like leaving your computer on keep slipping your mind? Well, don’t sweat the small stuff and allow it to become a big problem. Instead, try using Off, which enables you to shut down your computer (regardless if PC or Mac) remotely. Whether for your home gaming rig or your office setup, this app helps you control power states of all computers at your disposal as well as be a means to monitor the computer usage of your kids. No more late night WoW for Jack and Facebook posting for Jill. One caveat: this app requires a small additional install on each computer. For less than a buck, it’s the least you can do for the environment. However, you still should fix that leaky faucet in the bathroom. Price: 99¢.