Crossref makes research objects easy to find, cite, link, assess, and reuse. Crossref is the official DOI (digital object identifier) link registration agency for scholarly and professional publications. Crossref operates a cross-publisher citation linking system that allows a researcher to click on a reference citation on one publisher’s platform and link directly to the cited content on another publisher’s platform, subject to the target publisher’s access control practices. This citation-linking network covers millions of articles and other content items from several hundred scholarly and professional publishers.
J-Gate is an electronic gateway to global e-journal literature. J-Gate provides seamless access to millions of journal articles. It has about 58,817 journals indexed with about 71,692,382 articles till date. The J-Gate platform is fronted by a simple, intuitive, and easy-to-use interface, and also gives users complete control over search filters. By allowing users to access content from a wide variety of publishers on a single platform, J-Gate exponentially increases journal usage.
Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines.
ICI World of Journals is a global database dedicated to scientific journals from around the world. The idea of the ICI Journals Master List database is to create a possibility for scientific journals from all over the world. Index Copernicus International.