Scratch is an open source, free program that doesn't need to be downloaded. Click on the image-link and choose 'try it out'
The tutorial is in a panel on the right hand side of the screen.
Scratch…well known and often used in schools. It is free to use online and will extend pupils use of block-style programming. Code club has some great worksheets and ideas...follow the link button to the coding drop box for all the projects and helpsheets