I couldn't find anything that I felt was 'user friendly' and started simply enough for my students. So I made my own. This is a self-paced workbook that introduces the students to using a language to write a program. The skills focused on include:-
Writing messages
adding colour
introducing variables
drawing shapes
question and answer commands
input/output programming

I wrote this to target my bright students in Year 4-8, but could easily be used as a introduction to the complexity and language of computer programing/coding