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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
The other option is the Sharp memory LCD. They're more expensive, but they are really nice. Huge viewing angle, good contrast and draw virtually no power.
https://www.adafruit.com/products/1393
http://www.espruino.com/MemoryLCD
The other interesting thing is I don't believe they need any external components, so if you were making a product you could literally just solder a connector onto a board and you're good to go - that would bring the cost down a huge amount.
But it is difficult to find a good replacement for those Nokia displays. If you can find out where to source the displays the Digole boards use I'm sure Espruino could be made to drive them directly. I'm interested in getting a reliable source of cheap low-power displays too, so if you found something I'd happily write the drivers.