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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
At the moment there's no 'nice' way to access external memory - you'd have to write code to read/write blocks of data via SPI. Having said that, you might find that the SD card is quite useful. You can stream sound off of it pretty reliably. I haven't tried streaming sound to it, but I think you could do that too.
If you're connecting to a tablet via USB you can really push data though. I think the real maximum via audio is 22000 baud, and i'm not sure how reliable it'd be.
OpenJScad looks really cool. I'd actually done a proof of concept a few years ago right here before I found someone doing something similar. I'm glad it's really been polished now - I'd definitely use it in preference to OpenSCAD!