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

• MiniFlyer for iPhone, iPod touch, and iPad: Reaction-time game
• DvO HD for iPad: Real-time strategy game
• SalaryBook for iPhone and iPod touch: Time-tracking software
• Prioritask for iPhone and iPod touch: Photo capture tool
• Data Master for iPhone and iPod touch: Data usage tracking tool
• Grafikal for iPhone, iPod touch, and iPad: Photo data collection
• Sushi Cook for iPhone, iPod touch, and iPad (pictured): Sushi preparation training