@Milimetric - Have you considered https://ckan.org/ for evaluation?

@BTullis perhaps you already saw but @Milimetric considered CKAN on the rubric and ultimately disqualified it:

CKAN is meant to work at a very large scale, governments with multiple branches collaborating on data hubs. As such, most of the integrations are meant to be done manually, with only minimal automation support. Details can be found in their docs, but it doesn't seem to meet our requirements, it's maybe something to consider for something bigger like an Open Knowledge Data Portal shared with our other open knowledge partners.

Completed: https://wikitech.wikimedia.org/wiki/Data_Catalog_Application_Evaluation/Rubric/data-catalog-evaluation_server_notes