Good Piano Teaching software ?

In my next build I'll be starting to use some Cakewalk software and getting a decent midi controller/keyboard.
However, I'd like to learn to play the keyboard/piano but don't want to pay for lessons at this stage.
Does anyone know of any decent keyboard/piano learning software from experience or reputation please?

It's funny, but I went to books.
Piano for dummies was a good start after years on the bass clarinet.