I've set up a WikiProject to collect info on #GLAM data services: https://www.wikidata.org/wiki/Wikidata:WikiProject_GLAM_data_registry
It would be great to team up, think of a data model, create some showcase items and collect metadata on API and data dumps.
@awinkler @tillgrallert @mia A very good initiative! I maintain a list of downloadable library catalogues at https://github.com/pkiraly/qa-catalogue#datasources, that you can reuse if it fits. I suggest some properties, that I think worth to records: number or records (or triplets) if it is known, alternative formats, and most importantly terms of use/licensing information.
