Walt Crawford has published "Gray OA 2014-2017: A Partial Followup" in Cites & Insights: Crawford at Large. A "grey journal" is a gold OA journal not in the Directory of Open Access Journals.
Here's an excerpt from the announcement:
It updates article-count and status-code information (but not APC/fee information) for gray OA journals not in DOAJ, adding full-year 2016 article counts and January-June 2017 counts, doubled for ease of comparisons. Journals in Gray OA 2012-2016 that have been added to DOAJ have been removed from the new report.
See also: "Gray OA 2012-2016: Open Access Journals Beyond DOAJ."
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