White Noise, originally $1.99, is today's free app. It's a sound app that helps you relax by playing customized sounds in the background, like a crashing wave. Or a soothing forest setting. It also has timers so you can personalize it.
TraKtor Digger, originally $0.99, is today's free app. Apparently, you use different tractor trailors to find the hidden gold nugget in the level and get it to your dump truck. I don't know about this one, but you can give it a try.
Word Puzzle for the Soul, originally $0.99, is today's free app. Sounds like a really good idea for a puzzle game. You're given a quote from a famous man or woman that is scrambled. You must but the tiles back in order so you can solve the puzzle.
Magic Puzzles: Seasons, originally $2.99, is today's free app. A jigsaw puzzle app that is themed around the seasons. 4 levels of complexity: 7x5 (35 pieces), 9x6 (54 pieces), 13x9 (117 pieces), 18x12 (216 pieces). Looks like a lot of fun.
FlightBoard, originally $3.99, is today's free app. Very useful if you fly the friendly skies. It turns your phone or tablet into an arrival/departure flight board. It updates every 5 minutes and looks very clean. I don't fly, but I'm downloading it.