В Google используют lua, для какого инфраструктурного проекта. Это прикольно.
Более того: Google loves LuaJIT. Причем любит достаточно сильно для того, чтобы пожертвовать 8000 EUR на создание 64битного порта Lua JIT:
Mike Pall:
The generous contribution of EUR 8,000 by Google Inc. helped to
close the final gap. My personal thanks go to Joshua Haberman,
Chris DiBona, Cat Allman and Ellen Ko at Google! Please read more
about their take on it at the official Google open source blog:
http://google-opensource.blogspot.com/2010/01/love-for-luajit.html (source) Joshua Haberman explains:
Our Lua usage isn't too widespread at the moment; it's really one
infrastructure project in particular that uses Lua to allow
user-defined functions to run within a tightly controlled container.
Lua was the best choice, because of its low overhead, fast execution,
and the ability to set limits on execution time.
Unfortunately I cannot be more specific, since the project is not
public.
(source)