JO's Custom Code is an extension (module) for Joomla that allows you to insert code into a module.

The extension was maintained by AppsNityThis is apparently no longer the case.

An archive of the description can be found here https://web.archive.org/web/20201030145255/https://extensions.joomla.org/extension/flexi-custom-code/

I renamed the extension mod_flexi_customcode => mod_jocustomcode

This module replaces the older module more maintained Flexi Custom Code.
With it you can add any type of code using php, html, CSS and JavaScript in all possible positions and quickly.

With it you can add all kinds of codes using php, html, CSS and JavaScript on every position possible easily and fast. It is all included either the simplet code and function or even the most complicated and tough, for example, various assigned code, ad sense code, embed code and other copy-paste codes...

I maintain the source code on  Github/mod_jocustomcode which is made compatible Joomla 5.x

Example:

Code inserted in the module that is displayed with ModuleAnywhere