The more serious ones help kids learn techniques to deal with their physical pain or strategies to calm down when angry. The more silly have kids getting a workout while pretending to be different animals. The goal of all of these apps and skills is to teach kids strategies so eventually they no longer need the app.
I'm a small development shop that will sub-contract out for audio and design assistance as needed. My hope is you find these apps to be helpful tools when working with kids. I love feedback, enhancement requests, or just a hello.