Lua is an extremely lightweight programming language with many features. It’s easy to learn. Most people encounter Lua while modding games, for example, Minecraft. But the language is robust enough to be used in industrial applications, as well as embedded into other software.
Sandbox
These tools let you code on your phone, tablet, or desktop computer.
Touch Lua
https://itunes.apple.com/us/app/touch-lua/id525273327?mt=8
Sigma Script
https://play.google.com/store/apps/details?id=cc.sidi.SigmaScript
Crashing into Lua
http://luatut.com/crash_course.html (press Esc to activate console)
iLuaBox Pro
https://itunes.apple.com/app/iluabox-pro/id437557082?mt=8
Support
Where to get support as you code and encounter error messages and bugs in your applications.
Lua Community
http://www.lua.org/community.html
Lua Mailing List
StackExchange
http://stackoverflow.com/questions/tagged/lua
LuaHub Forum
Google Groups
http://groups.google.com/groups?q=Lua+group:comp.*&scoring=d
Tutorials
Hands on tutorials, as well as the home page for the language and documentation.
Lua
http://www.lua.org/
http://www.lua.org/about.html
http://www.lua.org/pil/
Lua: Really for Beginners
http://lua.gts-stolberg.de/en/index.php?uml=1
Crashing Into Lua
Includes an inline Lua Interpreter to test and adapt code from this tutorial.
http://luatut.com/crash_course.html
Lua Tutorial
https://play.google.com/store/apps/details?id=com.blu.lua (Android app/book)
History
The history of the language.
History of Lua
Two presentations describe in detail the evolution of the Lua language.
http://www.lua.org/doc/hopl.pdf (PDF)
http://www.stanford.edu/class/ee380/Abstracts/100310-slides.pdf (PDF)
Wikipedia
http://en.wikipedia.org/wiki/Lua_%28programming_language%29
Lua, What is Lua? (Stack Overflow)
Among serious comments and insights, apparently Lua means toilet in Hawaiian.
http://stackoverflow.com/questions/1274972/lua-what-is-lua
Implementation
How to use this language on the internet and the real world, available to end users and customers.
In the Wild
How this language is used on the internet and in the real world.