For instance, according to the documentation available online:
- Ex Libris Primo looks to support OAI-PMH: http://www.exlibrisgroup.com/category/CuttingEdgeInterface (Look under "Highlights for Libraries" -> "Interoperable" bullet)
- EBSCO Discovery Service also looks to support OAI-PMH: http://www.ebscohost.com/discovery/catalog/institutional-repositories
So, simply point either of those at the DSpaceDirect OAI-PMH interface and then schedule the external service to harvest metadata from DSpaceDirect on a regular basis.
Every DSpaceDirect site has an OAI-PMH interface available at https://[dspacedirect-site-url]/oai/request?verb=Identify
For example: https://demo.dspacedirect.org/oai/request?verb=Identify