Doodle3D uses the following external projects:

Lua - Copyright (c) 1994–2013 Lua.org, PUC-Rio. - MIT license
Luafilesystem - Copyright (c) 2003 Kepler Project - MIT license
JSON.lua (http://regex.info/blog/lua/json) - Copyright (c) 2010-2013 Jeffrey Friedl - Creative Commons CC BY 3 license
urlcode.lua, part of CGILua - Copyright (c) 2003 Kepler Project - MIT license