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 $6 off, each is at the lowest price we've seen. The deals, all with applicable platforms noted:

• Tongue Tied! for iPhone, iPod touch, and iPad for 99 cents ($1 off): Tongue twister database
• Greed Corp for iPhone and iPod touch for 99 cents (pictured, $4 off): Turn-based strategy game
• Element Defense for iPhone, iPod touch, and iPad for 99 cents ($1 off): Tower defense game
• Kinotopic for iPhone and iPod touch for 99 cents ($1 off): Cinemagraph creation tool
• Tom Clancy's Rainbow Six: Shadow Vanguard for iPhone and iPod touch for 99 cents ($6 off): First-person shooter