Anti Spam
https://www.drupal.org/project/cleantalk
Encrypt
https://www.drupal.org/project/encrypt
Two factor Authenticaiton
https://www.drupal.org/project/tfa
Clone/Copy
https://www.drupal.org/project/bundle_copy
Import Content
https://www.drupal.org/project/contentimport (version 8)
Insecure: https://www.drupal.org/project/feeds
Workflow
https://www.drupal.org/project/maestro
https://www.drupal.org/project/workflow
Bulk Export
https://www.drupal.org/project/vbo_export (recommended for item selection)
version 8 - https://www.drupal.org/project/bulk_content_operation
File Encryption
https://www.drupal.org/project/sodium/ (Drupal Sodium Model)
Content Formatting
https://www.drupal.org/project/paragraphs
Version 8
https://www.drupal.org/project/paragraph_handler
https://www.drupal.org/project/paragraphs_features
File Upload Scanning
https://www.drupal.org/project/clamav
Shopping cart
https://drupalcommerce.org/extensions/module
https://www.drupal.org/project/basic_cart
Custom Shopping cart - Notification
https://www.drupal.org/project/commerce_stock_notifications
Commerce Reporting
https://www.drupal.org/project/commerce_reports
Cart API
https://www.drupal.org/project/commerce_cart_api
https://www.drupal.org/project/commerce_cart_advanced
https://www.drupal.org/project/commerce_cart_flyout
Export
https://www.drupal.org/project/node_export
https://www.drupal.org/project/views_data_export
Hosting options
https://pantheon.io/docs/support
Themes
https://www.drupal.org/project/writer