Lua's package manager LuaRocks and package repository MoonRocks
Lua is not UTF-8 safe (source)
Moonscript is a programmer friendly language that compiles to Lua. It's to Lua what CoffeeScript is to JavaScript
szensk wrote an article about Moonscript which includes critique e.g. the implementation of the class system
Busted is for elegant Lua and Moonscript unit testing
OpenResty is a fast web app server by extending Nginx
Lapis is a framework for building web applications using Moonscript or Lua that runs inside of a customized version of Nginx called OpenResty
ZeroBrane Studio is a lightweight Lua IDE with code completion, syntax highlighting, live coding, code analyzer, and debugging support for Lua 5.1, Lua 5.2, Lua 5.3, LuaJIT, and other Lua engines