Useful Drupal modules

Click on the module name for notes, comments, patches.
Recommendations (for and against) are my personal opinion only and may be out of date. Feel free to email with corrections/suggestions.

Why haven't you mentioned Drupal 9? As of December 2021 I've updated most of the sites I look after to Drupal 9 (experience: mixed). I haven't decided how to label future version compatibility as D10 will be coming soon as well. The upgrade_status module is superb. You're bound to have issues with composer. Also watch out for a nasty session headers bug with redirect_after_login.

(1 modules in list)
Module name or machine name
Any text in the notes
Name D8 Personally Tested Last Updated
Serial Field (serial) 2018-11-23

d.o. page

"Essential"

Creates a field with a serial number, so you can have the equivalent of a MySQL AUTO_INCREMENT field for a content type (if nodes are deleted the old serial number is not reused).

Although this only has a dev branch which hasn't had updates since April 2016, it does work in D8.

There's no direct migration path previous versions, but people have written their own migrations.

Check issue queue for patches - including: