Building websites with Drupal as Content Management System (CMS): Drupal is a powerful open-source framework with a great philosophy, a big community and many many modules.
Starting to use Drupal can be challenging - it's helpful to be able to watch and ask an experienced Drupal user to understand the whole architecture. Once you start to understand all the different pieces and how to bring them together, you start to love the brilliant concepts and can build ambitious websites.
There are several websites running with Drupal we're maintaining. Contact us if you want to learn Drupal or if you're already experienced and ready to contribute.
This website is also built with Drupal (using the new Olivero theme), although it's not very complex. The code for it is on github!