Lua, LuaJIT and interesting things

It's been (at least) 6 years since I've last written any Lua code.
I bumped into this:  https://github.com/SnabbCo/snabbswitch/wiki which looked really interesting.

Can Lua do this?
What is Lua up to?

Well there is LuaJIT and it is (apparently) very fast:
http://luajit.org/performance_x86.html

Hmm.. Where else can I find Lua?
In Erlang? https://github.com/rvirding/luerl

Okay. Time to get the new Lua book and get myself back up to speed.