Scirus is a comprehensive science-specific search engine on the Internet. Scirus searches over 450 million science-specific web pages, enabling you to quickly:

i. Pinpoint scientific, scholarly, technical and medical data on the Web.

ii. Find the latest reports, peer-reviewed articles, patents, pre prints and journals that other search engines miss.

iii. Offer unique functionalities designed for scientists and researchers.

CiteSeer is a scientific literature digital library and search engine that focuses primarily on the literature in computer and information science. CiteSeer was the first digital library and search engine to provide automated citation indexing and citation linking using the method of autonomous citation indexing. CiteSeer attempts to provide resources such as algorithms, data, metadata, services, techniques, and software that can be used to promote other digital libraries.

is a union catalog of digital resources. We provide access to these digital resources by "harvesting" their descriptive metadata (records) using OAI-PMH (the Open Archives Initiative Protocol for Metadata Harvesting). OAIster currently provides access to 13,397,122 records from 888 contributors.

Scitopia.org searches the entire electronic libraries of the leading voices in major science and technology disciplines and provides relevant results, without the noise of other Internet search engines. More than three million documents, including peer-reviewed journal content and technical conference papers, spanning 150 years of science and technology can be searched through the site.

This is a collection of bibliographies of scientific literature in computer science from various sources, covering most aspects of computer science. The collection currently contains more than 2 millions of references (mostly to journal articles, conference papers and technical reports), clustered in about 1500 bibliographies. More than 600 000 references contain cross references to citing or cited publications. More than 1 million of references contain URLs to an online version of the paper. Abstracts are available for more than 800 000 entries. There are more than 2000 links to other sites carrying bibliographic information.

Google Scholar provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources: peer-reviewed papers, theses, books, abstracts and articles, from academic publishers, professional societies, preprint repositories, universities and other scholarly organizations. Google Scholar helps you identify the most relevant research across the world of scholarly research.

Microsoft Academic Search is a free academic search engine developed by Microsoft Research Asia, and also serves as a test-bed for our object-level vertical search research. Microsoft Academic Search provides many innovative ways to explore scientific papers, conferences, journals, and authors, connecting millions of scholars, students, librarians, and other users together.

NCSTRL (pronounced "ancestral") is an international collection of computer science technical reports from CS departments and industrial and government research laboratories, made available for non-commercial and educational use. The NCSTRL collection is distributed among a set of interoperating servers operated by participating institutions.

The AGRIS search application provides access to a large collection of world literature covering all aspects of agricultural sciences and technology, including grey literature which is not available through normal publication and distribution channels. The AGRIS repository is continuously updated and currently contains over 2.3 million bibliographic references in the AGRIS AP XML format, from 1975 to date. This data is collected from AGRIS resource centres in over 100 countries worldwide.

Lets you search academic journals, technical reports, and other content for article titles, author names, article abstracts, and conference proceedings.

Searches an array of databases found in over a dozen science portals with only one query.

AGRICOLA (AGRICultural OnLine Access) serves as the catalog and index to the collections of the National Agricultural Library, as well as a primary public source for world-wide access to agricultural information. The database covers materials in all formats and periods, including printed works from as far back as the 15th century.

The NAL Catalog (AGRICOLA) is organized into two bibliographic data sets:

The NAL Online Public Access Catalog contains citations to books, audiovisuals, serials, and other materials, most of which are in the Library's collection. (The Catalog does contain some records for items not held at NAL.)

The Article Citation Database includes citations, many with abstracts, to journal articles (see Journals Indexed in AGRICOLA), book chapters, reports, and reprints, selected primarily from the materials found in the NAL Catalog.

BASE is the name of the multi-disciplinary search engine for scientifically relevant web resources which was created and developed by Bielefeld University Library. It is based on search technology provided by FAST Search & Transfer, a Norwegian company.

vascoda is a free of charge internet portal for all those looking for scientific and scholarly information. vascoda offers user-friendly access to reliable information and full texts from a wide range of different subject areas.

Starting with one standard user interface, one can choose either a subject-specific or an interdisciplinary search. Using modern search engine technology allows a fast and high-structured search across multiple sources, like subject specific databases, bibliographic databases and directories of internet sources.

ScientificCommons.org aims to provide the most comprehensive and freely available access to scientific knowledge on the internet.

The major aim of the project is to develop the world?s largest communication medium for scientific knowledge products which is freely accessible to the public. A key challenge of the project is to support the rapidly growing number of movements and archives who admit the free distribution and access to scientific knowledge. These are the valuable sources for the ScientificCommons.org project. The ScientificCommons.org project makes it possible to access the largely distributed sources with their vast amount of scientific publications via just one common interface. ScientificCommons.org identifies authors from all archives and makes their social and professional relationships transparent and visible to anyone across disciplinary, institutional and technological boundaries.

"Lalisio Literature" is a search engine designed to help you find the right literature for your research, studies, teaching and leisure.

"For this purpose, we cooperate with major providers of international literature databases: Top booksellers such as Amazon, Abebooks and Powell's are among our partners as well as open access repositories such as arXiv and PubMed Central. Due to the integration of open access repositories our users can find and access cutting-edge articles mostly free of charge. Based on our analyses of content from numerous sources, we develop helpful search suggestions and relevance indicators for your literature search and help you quickly identify the literature you really want."