The iTunes App Store offers downloads of several apps for Apple iPhone, iPod touch, or iPad which have dropped in price, as listed below. At up to $4 off, each is at the lowest price we've seen. The deals, all with applicable platforms noted:

• CodeRunner for iPhone and iPod touch for 99 cents (pictured, $1 off): Augmented reality game
• RushPlayer for iPhone, iPod touch, and iPad for 99 cents ($2 off): Video playback tool
• Pro Filter for iPhone and iPod touch for 99 cents ($3 off): Photo editing tool
• Rune Raiders for iPhone, iPod touch, and iPad for 99 cents ($1 off): Strategy game list
• Splashtop Remote Desktop for iPhone and iPod touch for 99 cents ($1 off): Remote access tool