- "32,000 OJS journal instances" - <https://pkp.sfu.ca/ojs/ojs-usage/>
- "over 10,000 journals" (using OJS) - <https://pkp.sfu.ca/ojs/>
- 5443 publications in PKP Index - <http://index.pkp.sfu.ca/>
- "There are approximately 3.24 million items that have been published in all known OJS journals, with 2.8 million of these coming from journals that meet the 10 articles per year filtering criteria." - <https://pkp.sfu.ca/ojs/ojs-usage/>

Posted a forum question: https://forum.pkp.sfu.ca/t/public-pkp-index-or-ojs-usage-datasets/60316