TOP 100 FREE APPS FOR KIDS - THOMAS & FRIENDS - ENGINE ACTIVITIES When my boys were younger (sniff!), they LOVED Thomas & Friends. Every birthday and holiday meant a new set or new trains added to their collection. This app is one that they would have loved (sniff!) had iPads/iPhones been around then - Thomas & Friends: Engine Activities. It's free for the usually ambiguous "limited time," which means download it now because it could go back to not-free at any time!