Today I discovered "Open Access Diamond journals" in a report (https://zenodo.org/record/4558704/files/OADJS-Findings.pdf https://zenodo.org/record/4558704/file

Today I discovered "Open Access Diamond journals" in a report (https://zenodo.org/record/4558704/files/OADJS-Findings.pdf https://zenodo.org/record/4558704/files/OADJS-Findings.pdf). These are low-scale peer-reviewed free-to-read free-to-publish non-commercial journals, typically supported by Universities or Goverment agencies. They serve diverse communities and are not predatory journals (they are free after all). The bad news is only half of them use DOI or embed licenses in the metadata. Are they indexed or archived somewhere? To my surprise, there are more than 350,000 papers published in OA Diamond journals every year, and most journals publish fewer than 25 articles a year.