It's just a mix of Espresso - because of the whole Java/JavaScript coffee connection and it being smaller, and a little bit of Arduino - because it's a microcontroller board, and to a lot of people just starting out, 'Microcontroller' and 'Arduino' mean exactly the same thing.
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.
It's just a mix of Espresso - because of the whole Java/JavaScript coffee connection and it being smaller, and a little bit of Arduino - because it's a microcontroller board, and to a lot of people just starting out, 'Microcontroller' and 'Arduino' mean exactly the same thing.