SJR (SCImago Journal Ranking) was developed by the University of Granada and takes into account not only the total number of citations, but also weighted citation rates per year, and quality indicators, such as the credibility of links (for example, the weight of a link to an article in journal “A” in the Nature journal will be different from the weight of the link to that the same article in a little-known Russian journal, which has few or no links to Scopus.
SNIP (Source Normalised Impact per Paper) was developed by the Centre for Science and Technology Studies (CWTS). It reflects the influence of contextual citing of the journal, which allows direct comparison of journals in different subjects. It takes into account the frequency with which authors cite other sources, the rate of development of the impact of the citation and the degree of coverage of the literature in the given field by the database.
JCR (Journal Citation Reports) are annual reports on a citation which provide complete information about the journals indexed in the database of the Web of Science Core Collection, the possibility of their comparison and search by specified parameters (impact factor, subject, title). User guide is available here