READER APP PLUG: Reader Glenn Howes writes: “I notice that sometimes you’ll publicize a reader’s book or something similar. Well, just today, I published a free children’s app, Frog Draw, which I’m quite proud of and put everything I’ve learned in 20 years of being a pro coder into. It’s aimed at 6-8 year olds and is a shape drawing app that amongst many other features allows you to put funny hats on people, although I hope children will find more creative uses for it.”