Lua Reference Manual  
   Reference Manual of the Lua programming language
   http://www.lua.org/manual/

Lua FAQ  
   Frequently Asked Questions about Lua
   http://www.lua.org/faq.html

Lua Cheia  
   A Lua distribution with incorporated many useful libraries. Libraries can be loaded dynamically, or it can be built in into the interpreter.
   http://luacheia.lua-users.org/

Lua-an extensible extension language  
   An overview of Lua.
   http://www.lua.org/spe.html

Lua-users.org  
   Lua-users Wiki, collaborative site for Lua programmers; Lua-l archive, searchable body of official Lua mailing list; Lua-users.org mini charter.
   http://lua-users.org/

Yindo  
   A internet game platform that combines Lua, OpenGL and OpenAL.
   http://www.yindo.com/

LuaSocket  
   A Lua extension library that provides support for the TCP and UDP transport layers within the Lua language.
   http://www.tecgraf.puc-rio.br/~diego/luasocket/

LuaDev  
   Lua dev tool for MacOSX. Includes Lua-Objective-C messaging interface.
   http://www.dekorte.com/Software/OSX/LuaDev/

Plua  
   A port of Lua 4.0 (plus a small IDE) for PalmOS handheld devices.
   http://netpage.em.com.br/mmand/plua.htm

Rozek: Notes about Lua  
   Andreas Rozek's Kua page. Lua in brief. Lua distributions. Modules and examples. Applications.
   http://www.andreas-rozek.de/Lua/index_en.html

Ldb  
   A debugger for Lua. [Free for pure academic, non profit use]
   http://www.inf.puc-rio.br/~roberto/ldb.html

toLua  
   Tool to simplify integrating C/C++ code with Lua, automatically generates binding code to access C/C++ features from Lua; maps C/C++ constants, external variables, functions, classes, and methods to Lua, via Lua API and tag method facilities. [Freeware]
   http://www.tecgraf.puc-rio.br/~celes/tolua/

TkLua  
   A binding Tk to Lua. [Freeware]
   http://www.tecgraf.puc-rio.br/~celes/tklua/

Doris  
   A Lua binding to the OpenGL graphics API and GLUI OpenGL widget set. [Open source, GPL]
   http://doris.sourceforge.net/

Kepler Project  
   A Web development platform for Lua with open source and binary distributions. It includes CGILua, LuaSQL and libraries.
   http://www.keplerproject.org/

Programming in Lua (the official book)  
   By Roberto Ierusalimschy; 2003. It is the official book about the language, giving a solid base for any programmer who wants to use Lua.
   http://www.inf.puc-rio.br/~roberto/book/

PowerBLua  
   A PowerBasic wrapper for calling Lua functions.
   http://mark0.ngi.it/code-powerblua-e.html

PBLua  
   A PureBasic extension (PureLibrary) and a DLL with import libraries for PureBasic, that allows execution of Lua scripts from within PureBasic applications or games. [Freeware]
   http://pblua.florian-s.com/

CGILua  
   A tool that uses Lua as a server-side scripting language for creating dynamic Web pages. Both pure Lua scripts and HTML templates are supported and can be handled via CGI, FastCGI, mod_lua, ISAPI and other APIs.
   http://www.keplerproject.org/cgilua/

LuaForge  
   GForge installation for the Lua language community. A free repository for Lua projects management, categorization, issue tracking, and statistics.
   http://www.luaforge.net/

LuaJava  
   A scripting tool for Java. It allows scripts written in Lua to manipulate components developed in Java without any need for declarations or any kind of preprocessing.
   http://www.keplerproject.org/luajava/

Reuben Thomas: Lua  
   Some comments and Lua port downloads for: Red Hat RPM, EPOC standalone SISs.
   http://rrt.sc3d.org/Lua