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Recommendations (for and against) are my personal opinion only and may be out of date.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.

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Name D8 Personally Tested Last Updated
Address (address) 2018-11-24

d.o. page

Used to be called addressfield.  Adds one dependency - commerceguys/addressing.

This is a bundle of address fields, the correct combinations are shown depending on which country the user selects via a dropdown.
You can configure which countries are allowed per field instance.
To set the default, use the Manage Form Display tab.

It validates postcodes are in the correct format. 

Also supports 'zones' (groups of countries/subdivisions) for shipping/tax purposes.