This is MIT app inventor and is the same place I have been working on an app with multible app inside of it.
Click here to go to MIT app inventor
These are the blocks of code I used for one of my apps called paint pot
My design page
The home page on a kindle fire tablet
this is my qr code you can scan it to download my app only works for android.
My freind and I are creating an app called a dream project and is is going to be a game were you can play against each other on the same device and try to score on each other. There will be at least 2 different modes.