A great way to support the Lua project is to buy a book published by Lua.org. They make great gifts, too!
The Lua project is hosted by LabLua, a laboratory of PUC-Rio (a non-profit educational organization). Your contribution will complement the support we need to keep the Lua project running and will allow us to dedicate more effort to it.
A nice discussion of the costs of developing free software and a good case for why and how you can contribute to a free software project is made by Mary Gardiner in HOWTO Pay for Free Software.
Thank you for supporting Lua!
The books below are published by Lua.org. They are available at the main online stores, such as the Lua Bookstore at Amazon, or as e-books at Feisty Duck. All proceeds from the sale of theses books go directly to support the Lua project.