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Recommendations (for and against) are my personal opinion only and may be out of date.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 December 2021 I've updated most of 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.

(131 modules in list)
Module name, text of notes
Name Notes last updated Sort descending Avoid (imo) "Essential" D8 Personally Tested
Alexa 2017-02-06
Exclude Node Title 2017-02-06
Flippy 2017-02-06
Group 2017-02-07
AddToAny Share Buttons 2017-02-07
Pathauto 2017-02-07
PDF Reader 2017-02-07
Entityqueue 2017-02-07
Automatic Nodetitles 2017-02-07
HMS Field 2017-02-08
Field collection 2017-02-08
Telephone 2017-02-08
Twig Xdebug 2017-02-08
Prepopulate 2017-02-08
Unique field ajax 2017-02-08
Restrict Login or Role Access by IP Address 2017-02-08
IMCE 2017-02-08
Autofocus 2017-02-08
Autosave 2017-02-08
Block Visibility Groups 2017-02-08
Flood Control 2017-02-08
TagCloud 2017-02-20
Redirect 2017-02-20
Token 2017-02-24
Module builder 2017-02-26
Web Profiler 2017-02-26
Image Lazyloader 2017-02-27
Flag 2017-03-13
Warden 2018-09-17
Advanced Page Expiration 2018-09-17
Two Factor Authentication 2018-09-17
Features 2018-09-17
Configuration Update Manager 2018-11-19
Configuration Override Warn 2018-11-19
Bamboo Twig 2018-11-19
Views Secondary Row 2018-11-19
General Data Protection Regulation 2018-11-19
@font-your-face 2018-11-19
CKEditorHeight 2018-11-19
Memcache API and Integration 2018-11-19
String Overrides 2018-11-19
SEO Checklist 2018-11-19
Structure Sync 2018-11-19
Datetime Range 2018-11-19
D8 Editor Advanced link 2018-11-20
Masquerade 2018-11-20
Better Exposed Filters 2018-11-20
Automatic Entity Label 2018-11-20
ClamAV 2018-11-20
SMTP Authentication Support 2018-11-20
Node Export 2018-11-20
Required by role 2018-11-20
Config Ignore 2018-11-20
Role Delegation 2018-11-20
Role Watchdog 2018-11-20
Allowed Formats 2018-11-20
Permissions Filter 2018-11-20
Coder 2018-11-21
Field Permissions 2018-11-21
Real Name 2018-11-21
Refreshless 2018-11-21
Snippet Manager 2018-11-21
Feeds 2018-11-21
Field Formatter Condition 2018-11-21
Menu Token 2018-11-21
Views exposed form layout 2018-11-21
Entity Embed 2018-11-21
Nagios 2018-11-21
Contact Storage 2018-11-22
Entity Access Audit 2018-11-22
Trash 2018-11-22
Field Tools 2018-11-22
Google Authenticator login 2018-11-22
Pathologic 2018-11-22
Paragraphs 2018-11-22
Mollom - DEPRECATED 2018-11-22
Simple OAuth 2018-11-22
View Migration 2018-11-23
Serial Field 2018-11-23
AJAX Comments 2018-11-23
Double Field 2018-11-23
Address 2018-11-24
Raven 2018-11-25
Computed Field 2018-11-25
Environment Indicator 2018-11-26
Password policy 2018-11-26
Layout builder 2018-11-26
Webform Views Integration 2018-11-26
CKEditor Wordcount 2018-12-06
CKEditor Custom Config 2018-12-06
Configuration Read-only 2018-12-07
Comment Notify 2018-12-15
Automatic User Names 2019-02-20
Mydropwizard 2019-03-13
Captcha 2019-04-01
User restrictions 2019-04-01
Spambot 2019-04-05
Administration Views 2019-12-21
Views taxonomy term name into ID 2019-12-21
Views infinite scroll 2019-12-21
Add another 2019-12-21
Toolbar menu 2019-12-21
Content access 2019-12-21
Login email or username 2019-12-21
CSS Editor 2019-12-21
Save edit 2019-12-21
Ngrok for drupal 2019-12-21
Field group 2019-12-21
Twig VarDumper 2019-12-30
Menu position 2020-01-26
Webform 2020-02-09
reCAPTCHA 2020-02-10
Twig Extensions 2020-02-13
Rabbit hole 2020-02-17
Honeypot 2020-03-02
Devel 2020-03-05
Resave nodes 2020-04-21
Table trash 2020-04-26
Coffee 2020-05-10
Upgrade Status (for Drupal 9) 2020-05-16
Username policy 2020-06-24
Node Page Disable 2020-11-05
Twig Tweak 2020-11-08
Responsive and off-canvas menu 2020-11-18
Views Contextual Filters OR 2020-12-07
Rules 2021-04-12
Metatag 2021-04-28
Views Aggregator Plus 2021-05-12
Conditional Fields 2021-08-10
AudioField 2021-09-02
Redirect after login 2021-12-01