I don't work for them, I just read the FAQ at the bottom of TFA: | What's running JavaScript under the hood? | We're currently running a custom-built, real

I don't work for them, I just read the FAQ at the bottom of TFA: | What's running JavaScript under the hood? | We're currently running a custom-built, real time operating | system on top of a Lua Runtime. Your JavaScript is compiled | to Lua bytecode when you push your code, and that bytecode | is run on the runtime. It's this runtime that allows us to | have such low memory overhead. We may switch over to an | implementation of Libuv or a microLinux flavor in the future, | but that shouldn't change anything about the user experience | with Tessel (except it will be faster!)