Why Drupal?
https://www.drupal.org/why-drupal
Themes and websites
Drupal 7/8/9 modules
Opensource projects:
- https://gitlab.com/ulterius/News #A newsletter D8/9 module, mail registration and html mailer included.
- https://gitlab.com/ulterius/album #A photo gallery D8/9 module, based on colorbox.
- https://gitlab.com/ulterius/owcontrol #A Drupal7/Backdrop module as frontend and a python script with owfs software for the 1-wire devices as backend.