With more than 700.000 items, the BBF is today Europe's second largest library specialised in education. Like the Herzog-August-Bibliothek in Wolfenbüttel, it belongs to the association of German cultural research libraries fulfilling a national role.

Cairn offers the most comprehensive collection of French and Belgian journals in social sciences available online. Note that access to newer content is generally not free of charge (moving wall 2 to 5 years).

Copernicus Publications has been publishing highly reputable peer-reviewed open access journals since 2001. Through interactive, multi-stage open access publishing, Copernicus aims to bring real transparency into scientific quality assurance. The Max Planck Society covers article-processing charges for Max Planck authors centrally. Further details are available on the MPDL website.

The Digital Library of the Commons (DLC) is a gateway to the international literature on the commons. The DLC provides free and open access to full-text articles, papers, and dissertations. This site contains an author-submission portal; an Image Database; the Comprehensive Bibliography of the Commons; a Keyword Thesaurus, and links to relevant reference sources on the study of the commons.

Frontiers is a community-oriented open-access academic publisher and research network. It was launched in 2007 by scientists from the Swiss Federal Institute of Technology in Lausanne and aims to provide better tools and services to researchers in the Internet age. Since then, Frontiers has become one of the fastest-growing open-access scholarly publishers: over 400,000 high-quality, peer-reviewed articles have been published in about 200 community-driven journals across more than 300 specialty niches in science, medicine and technology. The Max Planck Society covers article-processing charges for Max Planck authors centrally. Further details are available on the MPDL website.

Im Rahmen der digitalen Monumenta Gremaniae Historica (dMGH) wurden in einem von der DFG geförderten Gemeinschaftsprojekt zwischen den MGH und der Bayerischen Staatsbibliothek, München, sämtliche Editionsbände der MGH digitalisiert und Open Access zur Verfügung gestellt. Neue Bände werden nach einer Schutzfrist von drei Jahren in die dMGH aufgenommen („moving wall“). Bis Ende 2010 war die Volltexterfassung der älteren Bände abgeschlossen. Eine Volltextsuche ist über die Abteilungen möglich: - Scriptores (Geschichtsschreiber) - Leges (Rechtstexte) - Diplomata (Urkunden) - Epistolae (Briefe) - Antiquitates (Dichtung und Gedenküberlieferung) - Quellen zur Geistesgeschichte des Mittelalters (QQ zur Geistesgesch.) - Deutsches Mittelalter. Kritische Studientexte (Dt. MA)

The OSF Preprints search combines records from various preprint repositories, including arXiv, bioRxiv, Cogprints, PeerJ, PsyArXiv, RePEc and SocArXiv.

ScienceOpen is a networking platform for scholars to enhance their research in the open, make an impact, and receive credit for it. The site provides advanced search and discovery functions, combined with post-publication peer review, recommendation, social sharing, and collection-building features. The Max Planck Society covers article-processing charges for ScienceOpen Research and ScienceOpen Poster centrally. Further details are available on the MPDL website.

The German National Library of Science and Technology (TIB) ‒ Leibniz Information Centre for Science and Technology and University Library is a central specialised library, responsible for operating the German National Library for technology, architecture, chemistry, information technology, mathematics and physics as well as the University Library for Leibniz Universität Hannover. As the world's largest specialised library in its fields, the library has excellent collections of technical and scientific specialist and research information.