Smiley face 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. Released in beta in November 2004, the Google Scholar index includes most peer-reviewed online academic journals and books, conference papers, theses and dissertations, preprints, abstracts, technical reports, and other scholarly literature, including court opinions and patents. While Google does not publish the size of Google Scholar's database, scientometric researchers estimated it to contain roughly 389 million documents including articles, citations and patents making it the world's largest academic search engine in January 2018. Previously, the size was estimated at 160 million documents as of May 2014.

The Directory of Open Access Journals (DOAJ) is a website that hosts a community-curated list of open access journals, maintained by Infrastructure Services for Open Access (IS4OA). The project defines open access journals as scientific and scholarly journals making all their content available for free, without delay or user-registration requirement, and meeting high quality standards, notably by exercising peer review or editorial quality control.

Smiley face Crossref (formerly styled CrossRef) is an official digital object identifier (DOI) Registration Agency of the International DOI Foundation. It is run by the Publishers International Linking Association Inc. (PILA)and was launched in early 2000 as a cooperative effort among publishers to enable persistent cross-publisher citation linking in online academic journals.Crossref is a not-for-profit association of about 2,000 voting member publishers who represent 4,300 societies and publishers, including both commercial and not-for-profit organizations.

Smiley face An International Standard Serial Number (ISSN) is an eight-digit serial number used to uniquely identify a serial publication, such as a magazine. The ISSN is especially helpful in distinguishing between serials with the same title. ISSNs is used in ordering, cataloging, interlibrary loans, and other practices in connection with serial literature.

Smiley face The PKP Index is a database of articles, books, and conference proceedings using PKP's free, open source Open Journal Systems, Open Monograph Press, and Open Conference Systems software applications. The Index covers all subject areas and includes content from publishers from around the world.

The electronic journals library is a service for the effective use of scientific full-text journals on the Internet. It offers fast, structured and standardized access to scientific full-text journals. It comprises 108,928 titles, 25,739 of which are purely online journals, on all subject areas. In addition, 136414 journals are listed by aggregators. 72,800 specialist journals are freely accessible in full text. The user libraries also offer their users access to the full texts of the e-journals they have subscribed to.

Smiley face ADVANCED SCIENCES INDEX Indexes journals. It is aiming at rapid evaluation and Indexing of all local and international journals. ADVANCED SCIENCES INDEX provides following services with Frequency of 12-Indexing round per year: .Journal panel for journals to monitor and control quality of their journals.

Smiley face Citefactor is a service that provides access to quality controlled Open Access Journals. The Directory indexing of journal aims to be comprehensive and cover all open access scientific and scholarly journals that use an appropriate quality control system, and it will not be limited to particular languages or subject areas. The aim of the Directory is to increase the visibility and ease of use of open access scientific and scholarly journals thereby promoting their increased usage and impact.

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ResearchBib is open access with high standard indexing database for researchers and publishers. Research Bible may freely index journals, research papers, call for papers, research position.

Smiley face Cosmos Foundation was founded by renowned scientists. A group of 100 scientist from various countries in different disciplines are started Cosmos (2010) with specific objective of providing quality information to the researcher. We offer academic database services to researcher. We provide impact factor and index of academic journals, books. We maintain academic database services to researchers, journal editors and publishers. Cosmos provides a detailed report of individual journal for further improvement of respective journal overall look up and technical aspect for better Impact Factor.

Smiley face EuroPub is a comprehensive, multipurpose database covering scholarly literature, with indexed records from active, authoritative journals, and indexes articles from journals all over the world. The result is an exhaustive database that assists research in every field. Easy access to a vast database at one place, reduces searching and data reviewing time considerably and helps authors in preparing new articles to a great extent. EuroPub aims at increasing the visibility of open access scholarly journals, thereby promoting their increased usage and impact.

SJIF Publishers Panel is full list of journals from database of It contains currently over 22000 journals from all over the world.This section allows you to place information about the journal, editors, and publisher, etc.

WorldCat is the world's largest network of library content and services. WorldCat libraries are dedicated to providing access to their resources on the Web, where most people start their search for information.WorldCat is used by librarians for cataloging and research and by the general public.

The name Scilit uses components of the words “scientific” and “literature”. This database of scholarly works is developed and maintained by the open access publisher MDPI. Scilit is a comprehensive, free database for scientists using a new method to collate data and indexing scientific material. Our crawlers extract the latest data from CrossRef and PubMed on a daily basis. This means that newly published articles are added to Scilit.

Semantic Scholar is an artificial-intelligence backed search engine for academic publications developed at the Allen Institute for AI and publicly released in November 2015. It uses advances in natural language processing to provide summaries for scholarly papers. The Semantic Scholar team is actively researching the use of artificial-intelligence, machine learning, Human-Computer interaction, and information retrieval.