Scientific Indexing Services – group of 70 scientist from various countries in different disciplines are started SIS with specific objective of providing quality information to the researcher.
http://www.sindexs.org/

Index Copernicus (Poland) – international scientometric database (Index Copernicus Journals Master List). This website includes indexing, ranking and abstracting of journals; it is also a platform for scientific collaboration and common research projects.
http://journals.indexcopernicus.com/+++,p5172,3.html

Polish Scholarly Bibliography (PBN) (Poland) - a scientific database of the Polish Ministry of Science and the Supreme Council. The PBN is part of POL-on-The System of Information on Higher Education(April, 2018).
https://pbn.nauka.gov.pl/sedno-webapp/journals/56713

Ulrich's Periodicals Directory – this database provides detailed information about world’s serial or periodical publications. All thematic areas and all periodic publications are registered in the database - as freely distributed, and subscribed, regardless of regularity of their publication.

WorldCat– the world's largest bibliographic database, covering over 240 million records of all types of products in 470 languages. The Base is created by joint efforts of more than 72 thousand libraries in 170 countries in the framework of the Online Computer Library Center.
https://www.worldcat.org/title/demohrafija-ta-socialna-ekonomika-demography-and-social-economy-demografija-i-socialnaja-ekonomika/oclc/907381882&referer=brief_results

EZB – Elektronische Zeitschriftenbibliothek, (Universitätsbibliothek Regensburg) – a library of electronic journals within the Regensburg’s University library information system (Germany). It contains information about 16.5 thousand scientific journals (of them 1,882 are free for access).
http://ezb.uni-regensburg.de/?2815935  

Google Scholar – The profile captures more citations of academic publications of a scholar than the Web of Science or Scopus; it automatically adds (and keeps track of links) the newly published documents, provides a better search for citations in non-English publications, and demonstrates a very significant h index.
https://scholar.google.com.ua/citations?hl=ru&user=BuMC3voAAAAJ&view_op=list_works&sortby=pubdate

ERIH PLUS – European Reference Index for the Humanities and the Social Sciences – the reference database on Humanities and Social Sciences. The publications are presented in English and some major European languages. ERIH PLUS reference and citation database is the world's largest platform for publishing and tracking in social and humanitarian research. Journals that are covered with ERIH PLUS monitoring system meet the strict European standards for academic publications. Publication’s indexing in ERIH PLUS allows researchers around the world to use academic materials published in the journal, and contributed to the increase in citation of authors in academic works of scientists from different countries.
https://dbh.nsd.uib.no/publiseringskanaler/erihplus/periodical/info?id=488830

CrossRef – association of academic publishers that develops a shared infrastructure to support more effective scholarly communications. Presently, the CrossRef system of citation covers over 68 million journal articles and other content items (books, dissertations, technical reports, etc.) from thousands of academic and professional publishers around the world.
https://doi.org/10.15407/dse

«Academic Periodicals of Ukraine» – the national technological platform, which provides the processes of editorial processing, publishing and post-publishing support of academic periodicals of Ukraine. The resource is being developed on the principles of partnership
http://journals.uran.ua/index.php/2309-2351

Information and analytical system «Bibliometrics of the Ukrainian Science» was created by specialists of the Vernadskyi National Library of Ukraine with intend to provide a society with a holistic view on the state of the national scientific environment. The system consists of: a register of scientists and research groups in Ukraine that are presented in our bibliometric profiles; analytical information for the expert’s estimates of effectiveness of the research activities; the national component of the project Ranking of Scientists (Cybermetrics Lab). The System resources are formed by processing bibliometric profiles of scholars at Google Scholar, bibliometric indicators of such commercial systems as Scopus and Web of Science.