CHANGELOG: 27 datasets available in total. Since v2.0.0, 5 datasets added and then 3 of them were merged to a single one containing all report sources about COVID-19 in Greece. The single resulting report has a unified logic re fields. Aggregations scripts re-factored accordingly. Regions vaccinations data are now automatically obtained via the official Greek Government Open Data API. It is now part of the aggregation process flow. References structure was updated. We now offer: References per organization (i.e. W.H.O., E.C.D.C., etc.). We link to the Scholarly Communion - Σύνδεσμος Ελληνικών Ακαδημαϊκών Βιβλιοθηκών project containing all Greek academic research re COVID-19 both via the project's dashboard (external link) and via CSV format (in covid19gr repository). We updated the citations selection policy following the T.R.A.A.P. (Timeframe Relevance Authority Accuracy Purpose) method proposed by The Sheridan Libraries, Johns Hopkins University. Minor updates to the Resources sector. Finally, we introduced a universal open data schema in .json format using the Data Package Creator of frictionlessdata.io. The dataset is published under the Public Domain CC0-1.0 license. Feel free to reuse!