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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
I don't think there is anything that would fit in the same form factor.
Having said that you can overclock the chips. The f103 in the original board isn't great as afaik if you want USB then 72mhz is mandatory. However the f401 allows different clocks while keeping USB running.
If the process tech and core is the same as the F407 then it might be possible to double the clock speed to 168mhz