EBSCO MLA International Bibliography
MLA International Bibliography offers an online access to a detailed bibliography of journal articles, books and dissertations. Produced by the Modern Language Association, USA, the access to this bibliography dates back to 1920's and contains over 2.3 million citations from more than 4400 journals & series and 1000 book publishers. http://search.ebscohost.com/
MathsSciNet
MathSciNet is an electronic & easily searchable database of reviews, abstracts and bibliographic information for much of the mathematical sciences literature. This database contains over 2 million items. Bibliographic data from retro-digitized articles dates back to the early 1800s. Over 100000 new items are added each year, most of them classified according to the Mathematics Subject Classification. http://www.ams.org/mathscinet/
SciFinder
SciFinder is a research discovery tool that allows access to a wide diversity of research from many scientific disciplines, including biomedical sciences, chemistry, engineering, materials science, agricultural science, and more! With a single source, one can explore scientific information in journal and patent literature from around the world, as well as reputable web sources:
References from more than 10,000 currently published journals and patents from more than 63 patent authorities
Important scientific discoveries from the present to the mid-1800s
The latest scientific breakthroughs almost as soon as they are published with references added daily and some patent information as recent as 2 days ago
The world's largest collection of organic and inorganic substance information
Scopus
Scopus, an abstract and citation database of peer-reviewed literature produced by Elsevier Publishing. It offers integrated web search plus linking to full-text articles and other information resources as well as broad coverage of scientific, technical, medical, arts, humanities and social sciences literature. It covers over 21,000 titles from more than 5,000 international publishers. It Scopus offers smart tools which provides facility to search, retrieve, track, analyze and visualize the research. http://www.scopus.com/
Free/Open Access
Arachne
Arachne is the central Object database of the German Archaeological Institute (DAI) and the Archaeological Institute of the University of Cologne. Arachne is intended to provide archaeologists and Classicists with a free internet research tool for quickly searching hundreds of thousands of records on objects and their attributes http://arachne.uni-koeln.de/drupal/
BASE - Bielefeld Academic Search Engine
BASE is one of the world's most voluminous search engines especially for academic open access web resources. BASE is operated by Bielefeld University Library. http://www.base-search.net/
ChemSpider
ChemSpider is a free chemical structure database providing fast text and structure search access to over 30 million structures from hundreds of data sources. http://www.chemspider.com/
ChemXSeer
ChemXSeer is an integrated digital library and database allowing for intelligent search of documents in the chemistry domain and data obtained from chemical kinetics. http://chemxseer.ist.psu.edu/
CiteSeerx
Citeseerx is a scientific literature digital library and search engine that focuses primarily on the literature in computer and information science. Citeseerx aims to improve the dissemination of scientific literature and to provide improvements in functionality, usability, availability, cost, comprehensiveness, efficiency, and timeliness in the access of scientific and scholarly knowledge. http://citeseerx.ist.psu.edu/
Civil Engineering Database (CEDB)
CEDB is a free bibliographic database offering over 200,000 records of all publications by American Society of Civil Engineers. It is updated at the end of each month. The update includes the journal content for the following month and all other content published in the previous month. http://cedb.asce.org/cedbsrch.html
CORE
CORE (COnnectingREpositories) aims to facilitate free access to scholarly publications distributed across many systems. As of today, CORE gives you access to millions of scholarly articles aggregated from many Open Access repositories. http://core.kmi.open.ac.uk/search
DBLP: The Collection of Computer Science Bibliographies
The DBLP server provides bibliographic information on major computer science journals and proceedings. Initially the server was focused on DataBase systems and Logic Programming (DBLP), now it is gradually being expanded toward other fields of computer science. http://liinwww.ira.uka.de/bibliography/Misc/DBLP/
Directory of Open Access Journals (DOAJ)
DOAJ is an online directory that indexes and provides access to quality open access, peer-reviewed journals. http://doaj.org/
DOAB: Directory of Open Access Books
DOAB provides open access to over 854 Academic peer-reviewed books from 25 publishers. http://www.doabooks.org/
ERIC- Educational Resource Information Centre
Provides a digital library of education-related resources.Contains over 1.1 million citations covering research documents, journal articles, technical reports, program descriptions and evaluations, and curricular materials in the field of education.Also includes more than 107,000 full text non-journal documents indexed by the ERIC database. Approximately one-half of the entries in the ERIC database are to ERIC documents. http://eric.ed.gov/
Europe PubMedCentral
PubMed Central is a free digital database of full-text scientific literature in biomedical and life sciences. http://europepmc.org/About
Google Scholar
Google Scholar is a freely accessible web search engine that indexes the full text of scholarly literature across an array of publishing formats and disciplines. http://www.google.com/schhp?hl=en
Indian Science Abstracts
Indian Science Abstracts (ISA) is database which covers the abstracts of scientific work done in India since 1965. Original research articles short communications, review articles, and informative articles published in current Scientific and technical periodicals, as well as Indian standards and thesis are reported in ISA. It is a leading abstracting database in India covering entire spectrum of Science and Technology including Intellectual Property Rights, Management and Library & Information Science. http://isa.niscair.res.in/isa_search.jsp
Microsoft Academic Search
Microsoft Academic Search is a free academic search engine developed by Microsoft Research. It covers more than 48 million publications and over 20 million authors across a variety of domains with updates added each week. http://academic.research.microsoft.com/
OALib: Open Access Library
OALib consists of a Search Engine, based on a database with metadata of Open Access (OA) papers, a Journal with OALib Articles, Index with metadata entries of external OA journal articles, and the Repository with own OALib PrePrints as well as external preprints and postprints, all stored in one of the 322 OALib Disciplinary Repositories http://www.oalib.com/
PubMed
PubMed comprises more than 23 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites. http://www.ncbi.nlm.nih.gov/pubmed
POPLINE
POPLINE provides access to 370,000 carefully selected publications and resources related to family planning and reproductive health http://www.popline.org/
Refdoc: The Reference in Scientific Document Supply
As a digital scientific library, INIST-CNRS has been helping researchers, engineers and information professionals with their work for the past 20 years by providing access to, referencing, distributing and archiving information.Has53 million indexed records of articles, books, conference proceedings in the fields of science, technology, medicine, Humanities and Social Sciences. The articles come from 178,000 different journals. 400,000 monographs are listed. http://www.refdoc.fr/?traduire=en
ROAD: Directory of Open Access scholarly Resources
ROAD: Directory of Open Access scholarly Resources, is a service offered by the ISSN International Centre with the support of the Communication and Information Sector of UNESCO. Launched as a beta version on 16th December 2013, ROAD will be developped during 2014 (extension of the coverage, additional features...). http://road.issn.org/
Social Science Research Network
Social Science Research Network (SSRN) is devoted to the rapid worldwide dissemination of social science research and is composed of a number of specialized research networks in each of the social sciences. http://www.ssrn.com/
The OAIster database
OAIster is a union catalog of millions of records representing open access resources that was built by harvesting from open access collections worldwide using the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH). Today, OAIster includes more than 30 million records representing digital resources from more than 1,500 contributors. http://www.oclc.org/oaister.en.html
Wolfram | Alpha
Wolfram | Alpha is an engine for computing answers and providing knowledge. It works by using its vast store of expert-level knowledge and algorithms to automatically answer questions, do analysis, and generate reports. http://www.wolframalpha.com/
WorldCat: the World's Largest Library Catalog
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. https://www.worldcat.org/