arXiv is an e-print service in the fields of physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics. It provides access to more the 1.3 million e-prints. The Max Planck Society is a member institution of arXiv.

Education Systems International is an Internet guide on education systems worldwide. The database offers links to institutions, databases, full texts and collections of facts from more than 230 countries and regions, which are of interest for users who work in educational research and administration. -- BildungsSysteme International als "Subject Internet Guide" des DIPF bietet Links zu Bildungsministerien, Bildungseinrichtungen, Fachgesellschaften, nationalen und internationalen Organisationen, zu Datenbanken, Volltexten und Fakteninformationen gegenwärtig aus mehr als 230 Ländern und Regionen.

Each of the 371 databases of BioCyc describes the genome and metabolic pathways of a single organism. The BioCyc databases are divided into 3 tiers, based on their quality: Tier 1: 3 Databases, which have been created through intensive manual efforts and receive continuous updating: 1) *EcoCyc* describes the model organism Escherichia coli K-12. 2) *MetaCyc* describes metabolic pathways and enzymes for more than 1,500 organisms. 3) *BOCD* (BioCyc Open Compounds Database) is an open collection of chemical compound data from the BioCyc databases. BOCD includes metabolites, enzyme activators, inhibitors, and cofactors. Tier 2: 20 Databases, which were computationally generated and have undergone moderate curation. Tier 3: 349 Databases, which were also computationally generated, but have undergone no curation. Scientists can use the BioCyc Web site to visualize individual metabolic pathways or to view the complete metabolic map of an organism. The latter diagram can be used to analyze gene expression, proteomics, or metabolomics data, such as to produce animated views of time-course gene-expression experiments. The BioCyc Web site also provides genome browsing capabilities, and for the *EcoCyc* databases in particular, provides extensive information about transcriptional mechanisms of gene regulation.

A 100 million word collection of samples of written and spoken language from a wide range of sources, designed to represent a wide cross-section of current British English, both spoken and written.

Clio-online is a central Internet gateway for historical scholarship in teaching and research. Sponsored by the Deutsche Forschungsgemeinschaft (DFG), the gateway enables efficient access to the diverse range of historical online ressources available to scholars and teachers within the field of history. Clio-online ist ein zentrales Internet Fachportal zur Geschichte. Seit Mai 2002 von der Deutschen Forschungsgemeinschaft gefördert, ermöglicht das Projekt durch seine Online-Dienste und Service-Angebote einen effizienten Zugang zu den umfangreichen Online-Ressourcen innerhalb der Geschichtswissenschaften.

Welcome to CogPrints, an electronic archive for self-archive papers in any area of Psychology, neuroscience, and Linguistics, and many areas of Computer Science (e.g., artificial intelligence, robotics, vision, learning, speech, neural networks), Philosophy (e.g., mind, language, knowledge, science, logic), Biology (e.g., ethology, behavioral ecology, sociobiology, behaviour genetics, evolutionary theory), Medicine (e.g., Psychiatry, Neurology, human genetics, Imaging), Anthropology (e.g., primatology, cognitive ethnology, archeology, paleontology), as well as any other portions of the physical, social and mathematical sciences that are pertinent to the study of cognition.

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. You may now read "DBLP" as "Digital Bibliography & Library Project". The server indexes more than 380000 articles and contains several thousand links to home pages of computer scientists (May 2003).

DART-Europe is a partnership of research libraries and library consortia who are working together to improve global access to European research theses. The Dart-Europe E-theses Portal enables access to open access research theses from nearly 600 universities in 28 European countries.

"Data Services for the Social Sciences" is a department of GESIS - Leibniz Institute for the Social Sciences. Its mission is to foster FAIR data, open science and reproducible research in the quantitative and computational social sciences. To ensure that data holdings remain usable and interpretable over the long term, it offers sustainable infrastructures and services for data management, curation, and long-term preservation. ​These include archiving services with different curation levels for different needs as well as access to archived data including access to sensitive data in the GESIS Secure Data Center. The services also cover the data registration agency da|ra and training on data management for easier retrieval and re-analysis of data.

DBIS (Datenbank-Infosystem) is a web application to find scientific databases. It includes licenced and free databases for most disciplines.

DEPATISnet is a service provided to you by the German Patent and Trade Mark Office. You can conduct online searches in patent publications from around the world stored in the database of DEPATIS, the in-house patent information system of the GPTO.

The Deposit Once of the Technische Universität Berlin makes qualified scientific text documents and research data of members of the TU Berlin available online. The repository is committed to the principles of Open Access and includes parallel publications from peer-reviewed publishers (post-prints) as well as dissertations, monographs, conference proceedings, collections and other scientific treatises.

The ECOLEX database includes information on treaties, international soft-law and other non-binding policy and technical guidance documents, national legislation, judicial decisions, and law and policy literature. Users have direct access to the abstracts and indexing information about each document, as well as to the full text of most of the information provided.

EconBiz - a suject portal for economics and business studies - supports you in retrieving economic literature. It offers a literature search across important German and international databases, including the holdings of ZBW, and provides access to information services of libraries. EconBiz - die Virtuelle Fachbibliothek Wirtschaftswissenschaften - unterstützt Sie bei der Recherche wirtschaftswissenschaftlicher Fachinformationen. Sie können in Internetquellen, in Online-Katalogen und Volltexten recherchieren und auf Informationsdienstleistungen von Bibliotheken zugreifen. Enthält neben aktueller Literatur viele Publikationen , die für Wirtschaftshistoriker interessant sind (1500 ff).

EconStor is the Open Access server of the German National Library of Economics, Leibniz Information Centre for Economics. EconStor provides a basis for the free publication of academic literature in economics.

The Document and Publication Server of the Humboldt-Universität zu Berlin is a service of the university library and the computer and media services. It offers the organisational and technical framework to all members of HU Berlin for publishing scientific documents digitally. Documents that are stored include single publications and publication series, collections, conference papers, research reports, journals (e-journals), theses and dissertations, master theses and seminar papers.

EMBL-EBI maintains the world’s most comprehensive range of freely available and up-to-date molecular databases. Developed in collaboration with institutions worldwide, the EMBL-EBI services let you share data, perform complex queries and analyse the results in different ways. You can work locally by downloading the data and software, or use the web services to access EMBL-EBI resources programmatically.

Since 1966, the ERIC Thesaurus has been a critical component of ERIC. It has evolved over the years from a printed publication used in libraries to an online tool that can help everyone find targeted resources in ERIC. This year, ERIC is updating the Thesaurus to add new terms and update existing entries. Find out how the Thesaurus supports ERIC users in their search foreducation resources. You will also hear about the work that takes place behind the scenes to maintain this large controlled vocabulary of more than 11,000 terms in the field of education.

Throughout Europe, national patent offices and the European Patent Office (EPO) offer free patent information on the Internet Patents reveal solutions to technical problems, and they represent an inexhaustable source of information: more than 80 percent of man's technical knowledge is described in patent literature. From the middle of 1998 onwards, esp@cenet users have been able to access the bibliographic data of all patents published in the preceding two years by any member state of the European Patent Organisation, as well as by the European Patent Office and the World Intellectual Property Organization (WIPO). In addition, full-page facsimile images of documents are also retrievable to facilitate more detailed analysis of these documents. The data for this particular service is stored at the relevant national office.