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
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.
ChemSpider is a free chemical structure database providing fast text and structure search access to over 30 million structures from hundreds of data sources.
ChemXSeer is an integrated digital library and database allowing for intelligent search of
documents in the chemistry domain and data obtained from chemical kinetics.
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.
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.
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.
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.
DOAJ is an online directory that indexes and provides access to quality open access, peer-reviewed journals.
DOAB provides open access to over 854 Academic peer-reviewed books from 25 publishers.
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.
PubMed Central is a free digital database of full-text scientific literature in biomedical and life sciences.
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.
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.
Ingentaconnect lets you search and browse over 9,610 publications.
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.
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
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.
POPLINE provides access to 370,000 carefully selected publications and resources related to family planning and reproductive health
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.
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…).
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.
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.
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.
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.