The Human Body is an app, but it was originally made the old fashioned way, with cut-out paper. Made by studio Tiny Bop, each page is interactive and visually accessible. As described on their site:
Everything, from the bones and brain to cells and veins, is animated by particle physics in this interactive playscape. Children can poke, probe, and examine the skeletal, muscular, nervous, circulatory, respiratory, and digestive systems. Each app contains a recording tool so you and your child can ask questions, listen, and respond to each other.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.