Hi AtoM Google Group, It is a Drupal 9 module based on the AtoM API. The module facilitates publishing archival description once, in U of T's Discover Archives (AtoM) finding aid database, and then pulls description data into Drupal as Nodes and Taxonomies. This data can then generate a searchable collections list (A-Z) in Drupal as well as a Drupal page per top-level fonds/collections. When data in our AtoM instance is updated, or new data is added, the module fetches and updates Drupal data at a designated frequency.
The goal of the module is to publish description data once in our AtoM instance but then reuse that data to facilitate "general user" browse/discovery of top-level descriptions on departmental websites where users may not normally encounter our AtoM instance. Our libraries/archives use Drupal for departmental websites.
Sharing in case this is of interest or useful to anyone.
Kelli Babcock | she / her
Digital Initiatives Librarian
University of Toronto Libraries
 Initial module planning, creation, and development included:
Rachel Beattie, Assistant Media Archivist
Gordon Belray, Information Architect
Andy Foster, Senior Software Engineer
Lillian Hogendoorn, Curator of Digital Experience
Bilal Khalid, Manager of Digital Library Applications
Sunny Lee, Digital Initiatives Programmer Analyst
Christina Stewart, Assistant Media Archivist
Chul Hee Yoon, Project Application Programmer Analyst
Thanks to Michael Andreae, Doug Fox, Abe Lam, and Jess Todd at Victoria University - E.J. Pratt Library for sharing their Drupal 7 AtoM viewer work with us, too.