A surfer of the Internet, a person that browses the web does not only leave trails in the network, but also takes from its produce. Agglomerated artifacts of images, documents and other media may be republished in an accessible form, such as a Document Management System.
Here we incur on the quest for a palpable environment for publishing medium-scale, personal collections.
There is an International Image Interoperability Framework which offers reusable image collection metadata standards and implementations.
ResourceSpace seems to be the only system in the field available as FLOSS that supports IIIF and PDFs in the same time. link