Though everything is free at the time of this posting, that can change at any time. Make sure you check the price before you purchase!
Of special note is Pocket, a great app for saving web articles to read later that used to be called Read It Later. Now free and very much worth the download!
Pocket (formerly Read It Later) - Reading Bombshells - Women's Fiction
3.9 stars over 184 reviews 4.9 stars over 11 reviews
HootSuite for Twitter, FB, etc On My Daddy's Shoulders - Kids
4.2 stars over 77 reviews 4.7 stars over 3 reviews
Robotek - Games Betting on Hope - Humor
3.8 stars over 27 reviews 4.9 stars over 7 reviews