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

• WiFi Security+ for iPhone, iPod touch, and iPad: Network security testing tool
• 8th Floor: Secret of Castle for iPhone, iPod touch, and iPad: Physics-based puzzle game
• Verticus for iPhone, iPod touch, and iPad: Infinite falling game
• Shadow ZIN: Ninja Boy for iPhone, iPod touch, and iPad: Sneaking action game
• NFL Kicker 13 for iPhone, iPod touch, and iPad (pictured): Football game