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Recommendations (for and against) are my personal opinion only and may be out of date.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? I will be adding this, but as of August 2021, this site you are reading is the only Drupal site of mine I've been able to upgrade to D9, so although you can check D9 compatibility status of all modules (use upgrade_status, it's superb) I can't speak from personal experience about any of them.

(1 modules in list)
Module name or machine name
Any text in the notes
Name D8 Personally Tested Last Updated
Real Name (realname) 2018-11-21

d.o. page

Use tokens to merge first name, last name or any other fields.
Then you can display the realname field in various places.  

Note: you have to add code to substitute the default username in the title of user node views - e.g. in mytheme_preprocess_block(&$variables)