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Recommendations (for and against) are my personal opinion only and may be out of date.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 February 2022 I've updated all 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.

What about sites still running Drupal 7? In short I still recommend leaving them on Drupal 7. Your decision is really if you will gain anything from Drupal 8/9 and for many then answer will be no, and one of the main hassles - apart from converting each content type one at a time, and setting up a new theme, will be recreating all your views by hand, as views can't be automatically upgraded.

(1 modules in list)
Module name or machine name
Any text in the notes
Name D8 Personally Tested Last Updated
Comment Notify (comment_notify) 2018-12-15

d.o. page

"Essential"

Allows users to receive emails for replies to their comments (or optionally for all comments on a node).  Can be toggled by content type (although not by comment type, if you have more than one comment entity).  In permissions, you can also control which roles can subscribe.  Can also set it so the author of a node also automatically gets emailed for every comment.

I'm using three patches:

I also have a site which uses two comment types; I wrote a patch to turn off the notification checkbox for one of them.