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Recommendations (for and against) are my personal opinion only and may be out of date.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
Features (features) 2018-09-17

d.o. page

Not recommended

Update: most people are now moving away from features. There is a Configuration Management initiative under discussion in Drupal 8.

Package up selected configuration for "features" (e.g. a blog or a photo gallery etc.) for reuse on other sites.  Not the same as the new D8 Config sync, which is for exchanging configs between different environments of the same site and requires a cloned DB sharing the same UUIDs.