Lua is open source software published under the MIT License. You can browse Lua's source code at https://www.lua.org/source/. Additionally, you can download both the source code and reference manuals for Lua from https://www.lua.org/ftp/. 

At the time of writing, no pre-built binaries are downloadable from the lua.org website. Pre-built binaries can be found on SourceForge at https://sourceforge.net/projects/luabinaries/. In this chapter, we will be using SourceForge to download binaries for Lua.