ASSDA (Australian Social Science Data Archive) is a national registry of social science data (http://assda-nesstar.anu.edu.au/webview/index.jsp).
DLF Collections: a list of collections maintained by Digital Library Federation (DLF) members (http://dlf.grainger.uiuc.edu/DLFCollectionsRegistry/browse/).
IESR (JISC Information Environment Service Registry) is a registry of collections, and services that provide access to those collections (http://iesr.ac.uk/registry/).
IMLSDCC (Institute of Museum and Library Service Digital Collections and Content) provides access to collection descriptions, and item-level access for specific collections (http://imlsdcc.grainger.uiuc.edu/).
INTRALLECT: Implementation of the ATOM Publishing Protocol for the SWORD Project (see below) http://www.ukoln.ac.uk/repositories/digirep/index/Intrallect_development
MICHAEL: The MICHAEL project (http://www.michael-culture.org/) is European Union initiative providing access to online museum and cultural heritage collections.
NSDL (National Science Digital Library) (http://nsdl.org/).
SCONE (The Scottish Collections Network) offers collection-level descriptions in a proprietary format (http://scone.strath.ac.uk/service/index.cfm).
SWORD (Simple Web-service Offering Repository Deposit) provides an ATOM Publishing protocol as part of the JISC Digital Repositories Programme. http://www.ukoln.ac.uk/repositories/digirep/index/SWORD_APP_Profile_1.0
UIUC (University of Illinois at Urbana-Champaign) Collection-Based Registries maintain various of collection-based registries (http://gita.grainger.uiuc.edu/registry/).
Ockham Registry (http://wiki.osuosl.org/display/OCKPub/Home)
ORCA Registry (Online Research Collections Australia) is a registry of collections, and services that provide access to those collections, similar in design to IESR. (https://pilot.apsr.edu.au/cosi/about.php) The ORCA Registry is developed by the Australian Partnership for Sustainable Repositories (APSR) and is the first implementation of the ISO2146 Registry specification.
OAI-ORE (Object Reuse and Exchange):
