In collaboration with authors and publishers, the National Center for Biotechnology Information (NCBI) provides free online access to books and documents in life science and healthcare.

A collaborative effort of the Networked Digital Library of Theses and Dissertations (NDLTD), OCLC, VTLS, and Scirus, the NDLTD Union Catalog contains more than one million records of electronic theses and dissertations. For students and researchers, the Union Catalog makes individual collections of NDLTD member institutions and consortia appear as one seamless digital library of electronic theses and dissertations.

Nomos eLibrary provides access to academic books and journals in the subject areas of law, political sciences, economics, media and communication sciences, history, sociology, education and cultural studies, European Union, health sciences. This collection is continuously extended by single e-book acquisitions by MPG libraries. The current MPI Criminal Law subscription comprises following collections: * Law 2007-2014

Nomos eLibrary provides access to academic books and journals in the subject areas of law, political sciences, economics, media and communication sciences, history, sociology, education and cultural studies, European Union, health sciences. The book selection has been continuously extended through the acquisition of individual eBook packages by MPG libraries. From volume 2022 onwards, access is given to the complete Nomos eBook portfolio. Max Planck researchers can publish their scientific work with Nomos as a print and in parallel as an Open Access eBook in the Nomos eLibrary. Further details are available on the MPDL website.

O'Reilly is an electronic reference library by providing access to technical content from leading publishers, including books, videos, proven learning paths, case studies, interactive tutorials and audio books. The learning platform gives access to the latest titles from O'Reilly and from Pearson's collection of imprints which include: Addison-Wesley Professional, Adobe Press, Cisco Press, Macromedia Press, New Riders, Peachpit Press, Prentice Hall PTR, Sun Microsystems Press, Que, and Sams. Microsoft Press titles are also available in O'Reilly.

The goal of OAIster is to create a collection of previously difficult-to-access, academically-oriented digital resources that is easily searchable by anyone.

The OAPEN Library contains freely accessible academic books, mainly in the area of Humanities and Social Sciences. OAPEN works with publishers to build a quality controlled collection of Open Access books, and provides services for publishers, libraries and research funders in the areas of dissemination, quality assurance and digital preservation. OAPEN serves as delivery platform for various open access initiatives, including Knowledge Unlatched.

OECD iLibrary is the online library of the Organisation for Economic Cooperation and Development (OECD) featuring its books, papers and statistics and is the gateway to OECD’s analysis and data. It also contains content published by the International Energy Agency (IEA), the Nuclear Energy Agency (NEA), the OECD Development Centre, PISA (Programme for International Student Assessment), and the International Transport Forum (ITF).

Oxford Handbooks Online in Law brings together the world's leading scholars to write review essays that evaluate the current thinking on a field or topic, and make an original argument about the future direction of the debate. Monthly updates introduce articles in advance of print publication and beyond the book, online-only content ensures the most current, authoritative coverage anywhere. We have purchased the collections Foundation (titles before 2012) as well as the collections 2012-2018 of the subject “Law”.

In OLC you have access more than 25 million articles from over 20,000 scientific periodicals beginning with the year of publication 1993. The Online Contents records are supplied by Swets and are updated daily.

Online Contents Anglistics is a subject oriented selection of bibliographic data from the Online Contents database. Currently 424 journals are being indexed back to the year of publication in 1993. -- Die Datenbank OLC Anglistik ist ein fachbezogener Auszug aus der Datenbank Online Contents. Zurzeit werden 424 Zeitschriftentitel retrospektiv bis zum Erscheinungsjahr 1993 ausgewertet. Damit enthält die Datenbank derzeit ca. 323.000 Aufsätze und Rezensionen aus dem Fachgebiet Anglistik und Amerikanistik.

Online Contents Arts and Art Sciences offers access to tables of contents of art and art related journals. It is a subject oriented selection of bibliographic data from the Online Contents database. It is regularly enhanced by table of contents data from additional periodicals out of the special collections of the State and University Library (SLUB) Dresden and the University Library Heidelberg.

OLC Chemistry is a subject oriented selection of bibliographic data from the Database Online Contents. This database is regularly enhanced by table of contents data from additional periodicals out of the special collections of TIB Hannover.

Online Contents Classics provides access to the tables of contents of journals in the field of classical studies, especially Greek and Latin Philology, Prehistory, Early History, Ancient History and Archaeology, Egyptology. It is a subject-oriented selection of bibliographic data from the Database Online Contents. This database is regularly enhanced by table of contents data from additional periodicals out of the special collections of the University Library Heidelberg as German central subject library for Archaeology and Egyptology and of the Bayerische Staatsbibliothek, as German central subject library for Greek and Latin Philology and Ancient History.

The creation and improvement of the Online Contents Contemporary History database was supported by the Deutsche Forschungsgemeinschaft within the framework of the Clio-online network and the Internet portal Zeitgeschichte-online until 2008. The further development of the database is co-ordinated by the Staatsbibliothek zu Berlin - Preußischer Kulturbesitz (SBB-PK) in cooperation with the Research Centre for Contemporary History in Potsdam, the Lower Saxon State and University Library Göttingen, the German central subject library for Anglo-American history, the Bayerische Staatsbibliothek (BSB; Bavarian State Library), the German central subject library for General History; History of Germany, Austria, Switzerland, France and Italy, East-European History, the Bibliothek für Zeitgeschichte in der Württembergischen Landesbibliothek Stuttgart as special library for the contemporary history and the library of the Stiftung Topographie des Terrors (Foundation Topography of Terror Berlin).

OLC East European Studies is a selection of bibliographic data from the Online Contents database which is supplemented weekly by additional data provided by a number of German libraries. The OLC Slavistics, which is maintained by the Berlin State Library - Prussian Cultural Heritage (SBB-PK) is contained in this selection. The creation and improvement of the Online Contents East European Studies database is currently supported by the Deutsche Forschungsgemeinschaft within the framework of the Virtual Library Eastern Europe (ViFaOst). The development of the database is coordinated by the Bayerische Staatsbibliothek (BSB) Munich and the Staatsbibliothek zu Berlin - Preußischer Kulturbesitz (SBB-PK).

OLC Economic Sciences is a subject oriented selection of bibliographic data from the Online Contents database that is regularly enhanced by table of contents data from 3,150 additional periodicals with more than 4,500,000 records of articles out of the special collections of the ZBW – Leibniz-Informationszentrum Wirtschaft and the university library of the Helmut Schmidt university, Federal Armed Forces, Hamburg.

Online Contents Educational Sciences provides access to the tables of contents of journals in the field of educational sciences. It is a subject-oriented selection of bibliographic data from the Online Contents database. This database is regularly enhanced by table of contents data from additional periodicals out of the special collections of the UB Erlangen-Nürnberg as German central subject library for Educational Sciences. It covers journal articles and reviews about various pedagogical disciplines, including home and foreign educational system, early childhood and preschool education, school and special school types, curriculum, teaching and teacher education, special needs education, vocational education.

The database OLC Environment is a subject oriented selection of bibliographic data from the Online Contents database that is regularly enhanced by table of contents data from additional periodicals out of the special collections of the TIB Hannover, the central subject library of Germany for technology and their related subjects, especially chemistry, computer science, mathematics and physics. Currently 514 journals are being indexed back to the year of publication in 1993.

OLC German language and literature studies is a subject oriented selection of bibliographic data from the Online Contents database and provides access to the tables of contents of journals in the field of German Studies. Currently 139 journals are being indexed, normally back to the publication year 1993. -- Die Datenbank OLC Germanistik ist ein fachbezogener Auszug aus der Datenbank Online Contents und erschließt Inhaltsverzeichnisse von Zeitschriften aus dem Bereich "Deutsche Sprache und Literatur". Zurzeit werden 139 Zeitschriften ausgewertet, in der Regel ab dem Erscheinungsjahr 1993. Damit enthält die täglich aktualisierte Datenbank gegenwärtig über 197.000 Aufsätze und Rezensionen (Stand: September 2019).