So, in recent OLAC presentation I talked about enabling Omeka or Drupal via recipes for OAI harvesting. Here is some links to internet chatter on these issues.

Koha

enable Items in KOHA OAI Harvesting

https://koha-community.org/manual/18.05/en/html/webservices.html

https://forums.zotero.org/discussion/38956/export-of-zotero-citation-to-marc-format-for-import-into-koha-lms

wordpress

Day 13: Harvest data with OAI-PMH

WordPress and Drupal

Creating an OAI-PMH Feed From Your Website

eHive

https://developers.ehive.com/

Catmandu

https://librecatproject.wordpress.com/tutorial/

Omeka
https://omeka.org/classic/docs/Plugins/OaiPmhRepository/