The iTunes App Store offers downloads of several applications for Apple iPhone and iPod touch for free, as listed below. At up to $4 off, each is at the lowest price we've seen. The deals:

• Mobius: Track Looper for iPhone and iPod touch: Music looping tool
• Zip Browser for iPhone, iPod touch, and iPad: .zip file viewer
• MassTransit for iPhone and iPod touch: Boston public transit tracking
• Smile Alarm for iPhone and iPod touch (pictured): Wake-up tool
• Undead Ocean for iPhone and iPod touch: Side-scrolling action game