Repositories are pages that are meant to collect information and advice of a specific type or area from the LW community.
They are similar to but distinct from List of Links pages, which focus on collecting existing resources (either LW articles or external) rather than collecting advice & data directly from participants.
This seems to be distinct from List of Links, but they’re similar enough that it might still be a merge candidate.
Kind of a cross between List of Links and Open Threads.