I find the Dora ones are often quite good.

They can be more or less educational though. There are quite a few of them to choose from. So, whenever we play a game together I try to find an educational one which contains those characters. My nephew really loves a handful of TV shows like Spongebob and Dora the Explorer. Kids pick up how to use that kind of thing really fast and having a touch screen made it much easier for my cousin to do whatever he wanted with it (obviously under a lot of supervision!). It was a bit clunky so I don't know how much it was used, particularly once his parents got a tablet. It had a keyboard that fitted over the usual keyboard but had bigger keys for children's hands and it loaded up reading and math computer software for young children. I also once bought for a young cousin, this system that was designed to be used with an ordinary computer. Generally they can only do a few things though. They are usually much cheaper, and more sturdy than an ordinary computer. You can actually get whole computers which are designed for children.

How to make a computer program for kids