The Audience Agency - Multi-site system and three websites
We worked with The Audience Agency to build three interlinked websites each with their own urls, theme but sharing a server and some content.

We used the Drupal content management framework to create a data structure and a custom theme switching system based on urls and data fields.
The sites contain elements of other systems such as the Booking Behaviour Report and Audience Spectrum map that we built as part of other work with The Audience Agency.
https://theaudienceagency.org
https://audiencespectrum.org
https://evidence.audienceanswers.org