Other Simple Pull Quotes plugins

I think this plugin was forked in 2013 here:
https://github.com/aaroncampbell/pull-quotes
and then that code was probably forked here:
https://github.com/FindingSimple/simple-pull-quotes/commits/master/simple-pull-quotes.php

None of these other plugins are in the WP plugin repository, but they have made a number of improvements that might be worth adopting.

https://ww.wp.xz.cn/plugins/simple-pull-quote/