Here are some of the Joomla Extensions we have encountered that are never going to have a working Joomla 4 version.
Ajax Intro Articles Module
"Ajax Intro Articles Module" is not available for Joomla 4. This module presents an alternative layout for displaying Joomla articles in a blog layout.
You do not need an extra extension for an article blog layout view in Joomla 4 as it is included as a menu item type in the core.
However, for simplicity we recommend these alternatives to our clients who use our Monthly Joomla Management Package: