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Following brief introductions to the development and benefits of open scholarship and to Semantic Web technologies, this paper describes OpenCitations and its data sets, tools, services, and activities. These include the OpenCitations Data Model; the SPAR (Semantic Publishing and Referencing) Ontologies; OpenCitations\u2019 open software of generic applicability for searching, browsing, and providing REST APIs over resource description framework (RDF) triplestores; Open Citation Identifiers (OCIs) and the OpenCitations OCI Resolution Service; the OpenCitations Corpus (OCC), a database of open downloadable bibliographic and citation data made available in RDF under a Creative Commons public domain dedication; and the OpenCitations Indexes of open citation data, of which the first and largest is COCI, the OpenCitations Index of Crossref Open DOI-to-DOI Citations, which currently contains over 624 million bibliographic citations and is receiving considerable usage by the scholarly community. <\/jats:p>","DOI":"10.1162\/qss_a_00023","type":"journal-article","created":{"date-parts":[[2020,1,23]],"date-time":"2020-01-23T14:38:13Z","timestamp":1579790293000},"page":"428-444","update-policy":"https:\/\/doi.org\/10.1162\/mitpressjournals.corrections.policy","source":"Crossref","is-referenced-by-count":112,"title":["OpenCitations, an infrastructure organization for open scholarship"],"prefix":"10.1162","volume":"1","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0530-4305","authenticated-orcid":true,"given":"Silvio","family":"Peroni","sequence":"first","affiliation":[{"name":"Digital Humanities Advanced Research Centre, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy"},{"name":"Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5506-523X","authenticated-orcid":true,"given":"David","family":"Shotton","sequence":"additional","affiliation":[{"name":"Research Centre for Open Scholarly Metadata, Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy"},{"name":"Oxford e-Research Centre, University of Oxford, Oxford, United Kingdom"}]}],"member":"281","reference":[{"issue":"3","key":"bib2","doi-asserted-by":"crossref","first-page":"1","DOI":"10.4018\/jswis.2009081901","volume":"5","author":"Bizer C.","year":"2009","journal-title":"International Journal on Semantic Web and Information Systems"},{"key":"bib3","volume-title":"Behaviours and technical recommendations of the COAR Next Generation Repositories working group","author":"COAR WG Next Generation Repositories","year":"2017"},{"key":"bib4","doi-asserted-by":"crossref","first-page":"78","DOI":"10.1007\/978-3-030-01379-0_6","volume-title":"Semantics, Analytics, Visualization","author":"Corbatto M.","year":"2018"},{"key":"bib5","volume-title":"RDF 1.1 concepts and abstract syntax","author":"Cyganiak R.","year":"2014"},{"key":"bib7","volume-title":"Proceedings of the 17th International Conference on Scientometrics and Informetrics (ISSI 2019)","author":"Di Iorio A.","year":"2019"},{"key":"bib8","volume-title":"Survey of current PID services landscape (deliverable No. D3.1)","author":"Ferguson C.","year":"2018"},{"key":"bib9","volume-title":"SPARQL 1.1 query language","author":"Harris S.","year":"2013"},{"issue":"2","key":"bib10","doi-asserted-by":"crossref","first-page":"1213","DOI":"10.1007\/s11192-019-03217-6","volume":"121","author":"Heibi I.","year":"2019","journal-title":"Scientometrics"},{"key":"bib11","volume-title":"Proceedings of the 17th International Conference on Scientometrics and Informetrics (ISSI 2019)","author":"Heibi I.","year":"2019"},{"issue":"1","key":"bib12","doi-asserted-by":"crossref","first-page":"205","DOI":"10.3233\/DS-190016","volume":"2","author":"Heibi I.","year":"2019","journal-title":"Data Science"},{"key":"bib13","volume-title":"Presented at the 19th ACM\/IEEE on Joint Conference on Digital Libraries","author":"Hosseini A.","year":"2019"},{"issue":"10","key":"bib14","doi-asserted-by":"crossref","first-page":"e3000385","DOI":"10.1371\/journal.pbio.3000385","volume":"17","author":"Hutchins B. 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