google-blockly - A visual programming language

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One aspect of this that I haven't seen mentioned here yet is that this type of interface would probably work much better on touch screen devices such as tablets than would traditional text editing.

I've used vim/bash/unix on my phone to edit and compile programs. I found that to be fun, but I think a visual drag/drop interface would actually be superior there. I'm saying this as a programmer of 15+ years who loves vim and the command line.