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Recommendations (for and against) are my personal opinion only and may be out of date.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
Webform (webform) 2020-02-09

d.o. page

"Essential"

One of the best maintained contrib modules.  Main benefits: nicely presented forms with powerful conditional logic, YAML configuration, flexible user permissions, very clean data storage, secure.  Codebase is also very much written "the Drupal way".

I'm currently using this patch to avoid AJAX errors - it's only necessary where you've both enabled Automatically save as draft when paging, previewing, and when there are validation errors, and are using a confirmation type like inline, that still uses AJAX to submit the form when there are no validation errors.

Troubleshooting install of webform external libraries: (Jan 2020)

Follow these instructions: https://www.drupal.org/node/3003140

If you get a composer SSL error, follow these instructions.

(specifically, you need to set openssl.cafile in php.ini)