Cataract - an environment for end-user programming in Lua 5.1

"Enable all people to modify the software they use in the course of using it." -- https://futureofcoding.org/episodes/033.html

"What if we, and all computer users, could reach in and modify our favorite apps?" -- https://www.inkandswitch.com/end-user-programming

"Software must be as easy to change as it is to use it" -- https://malleable.systems

README for Lua 5.1

What is Lua?

Lua is a powerful, light-weight programming language designed for extending applications. Lua is also frequently used as a general-purpose, stand-alone language. Lua is free software.

For complete information, visit Lua's web site at http://www.lua.org/ . For an executive summary, see http://www.lua.org/about.html .

Lua has been used in many different projects around the world. For a short list, see http://www.lua.org/uses.html .
Availability

Lua is freely available for both academic and commercial purposes. See COPYRIGHT and http://www.lua.org/license.html for details. Lua can be downloaded at http://www.lua.org/download.html .
Installation

Lua is implemented in pure ANSI C, and compiles unmodified in all known platforms that have an ANSI C compiler. In most Unix-like platforms, simply do "make" with a suitable target. See INSTALL for detailed instructions.
Origin

Lua is developed at Lua.org, a laboratory of the Department of Computer Science of PUC-Rio (the Pontifical Catholic University of Rio de Janeiro in Brazil). For more information about the authors, see http://www.lua.org/authors.html .