The iTunes App Store offers downloads of several apps for Apple iPhone and iPod touch for free, as listed below. (Select titles work with both the iPhone and iPad universally.) At up to $2 off, each is at the lowest price we've seen. The deals:

• System Monitor with Battery Max for iPhone / iPod touch: "All-in-one" system monitoring app
• Furious Cow for iPhone / iPad: Cow riding game
• Zombie Hunting for iPhone / iPod touch (pictured): Zombie shooter
• IntelliVocab for GRE and GMAT Deluxe Edition for iPhone / iPod touch: GRE and GMAT study aid