Lua is really cool, I like and know this language and have a bunch of my projects using it. But honestly - it's way too bloated for esp8266. If only it had twice as much ram...
I'm now looking towards a small lisp interpreter. These look way more simple, and don't really explode people's minds like forth does.[/quote]
Well, there was a time when most small computers came with a BASIC interpreter, and it is still somewhat popular on microcontrollers.
It's easy to learn, and runs well on small machines with little RAM.
And to be honest: I'm too dumb for Lua.