Global variable
package.path
print (package.path) ./?.lua;/usr/share/luajit-2.0.4/?.lua;/usr/local/share/lua/5.1/?.lua;/usr/local/share/lua/5.1/?/init.lua;/usr/share/lua/5.1/?.lua;/usr/share/lua/5.1/?/init.lua
package.path = package.path .. ';scripts/?.lua'
OOP library https://github.com/kikito/middleclass
Unit testing framework http://olivinelabs.com/busted/
Dump human readable info about everyting (very usefull for tables) https://github.com/kikito/inspect.lua
spawn process and fully control its input/output console
Yet Another Lua Object-Oriented Model http://fperrad.github.com/lua-Coat/
Filesystem control library https://keplerproject.github.io/luafilesystem/ Allows manipulation of file attributes, directory creation, link creation, locks