Through 18th Century German Literature Online, first editions and first published complete editions by 642 German-speaking authors of the 18th century are now available online. The 2,675 works with 4,494 volumes reflect the broad spectrum of German literature from the early stages of the age of Enlightenment to the later part of the period.

No less than 741 daily reports with approximately 5,795 pages have been analyzed for this edition. Some 70 reports are missing. The digital facsimiles can be searched both in full text and by using an index of names and subjects. In all, the database provides information about 16,000 men and women either arrested or being kept under surveillance by the Gestapo. The contents of this database can be searched separately or in combination with the contents of the National Socialism, Holocaust, Resistance and Exile 1933 – 1945 database.

For this database fundamental primary sources on the National Socialist state and the NSDAP, Nazi ideology and propaganda, National Socialist justice and legislation, on resistance and persecution, and annihilation and expulsion in the "Third Reich" have been compiled and digitized.

The Verfasser-Datenbank (Database of Authors) enables, for the first time, the renowned standard reference works Die deutsche Literatur des Mittelalters, Deutscher Humanismus 1480–1520, Frühe Neuzeit in Deutschland 1520–1620 and the Killy-Literaturlexikon to be used systematically in electronic form. Over 20,000 lexicon articles on authors of German literature, ranging from the very beginnings to the present, were cross-linked in this Online Reference Work and their content can be accessed in a targeted manner using differentiated search criteria. In ongoing updates, the Online Reference relating to the Middle Ages are revised in terms of content and supplemented by many current literature references which are linked to the library collections. An advisory panel of established experts guarantees the highest academic quality.

The BTL Online database provides electronic access to all editions of Latin texts published in the Bibliotheca Teubneriana, ranging from antiquity and late antiquity to medieval and neo-Latin texts. A total of approximately 13 million word forms are thus accessible electronically.

The database Building Types Online is a resource for the study and practice of architectural design. It is based on Birkhäuser's high international standing in professional architecture books, on the knowledge of the authors and editors who are leading experts in their fields, as well as on the technical quality of the illustrations. The database offers exclusive and unparalleled, highly flexible and detailed search and browse access to the contents of the Birkhäuser program on building types. All content was written and selected by internationally renowned authors in architectural design.

The Byzantinische Bibliographie Online includes the bibliographic sections of the Byzantinische Zeitschrift from volume 98 (2005) up to the present day. It contains around 30,000 entries in total, and each year about 4,000 entries will be added. The entries are organized systematically by subject area and enriched by short discussions and references to relevant review articles.

The Deutsche Biographische Enzyklopädie (DBE) [Dictionary of German Biography] provides information on roughly 62,000 individuals whose lives, works and achievements are considered remarkable to this very day. Reaching back as far as Charlemagne, the DBE covers individuals from all walks of public life who contributed to the cultural heritage of the German-speaking areas.

This Online Reference Work makes the most well-known, comprehensive, and reliable texts on German literature available for the first time online: The Encyclopedia of German Literature and its supplemental series, The Encyclopedia of German Literature: The 20th Century and the Encyclopedia of German Literature: The Middle Ages. Spanning an extended time scale from the early Middle Ages to the recent present, this Online Reference Work is unique for its comprehensive scope, featuring articles on German-language authors from Germany, Switzerland, Austria, and other European countries. In addition to profiling the lives and works of literary figures, this Online Reference Work also contains extensive information on research publications. The volumes on the Middle Ages cover German-language literature from the 8th to the 15th centuries, and are systematically organized by genre and topic area.

Jewish - Christian relations can look back on more than half a century of striking achievements. There are now initiatives and centers all over the world addressing fundamental issues. This is why now is the right moment to launch a comprehensive Encyclopedia of Jewish - Christian Relations. International experts at the cutting edge of their discipline summarize in two hundred entries more than two thousand years of Jewish - Christian interaction, assess the achievements of dialogue and provide joint perspectives and new avenues for the future.

The Encyclopedia of the Bible and Its Reception is the first-ever and only comprehensive reference work on the Bible and its reception.

Since 2009 and the publication of its initial entries, the encyclopedia has continued to be a groundbreaking reference work and is a must-have for institutions in the humanities, social and cultural sciences, as well theology and religious studies.

Enhanced Electronic Grammars (EEG) features comprehensive descriptions of languages from around the world. Through this unique Online Reference Work, full grammars are made available together in an interlinked and semantically-annotated format, allowing granular access to the grammatical data and enabling cross-language research of several grammars at the same time. In addition to cross-linguistic queries, each grammar can also be read and researched individually.

Through the research database German Literary Expressionism Online 151 journals, yearbooks, collections and anthologies from the early 20th century with 2,404 issues are now available in full text.

Germanistik, the leading international publication covering German Language and Literary Studies, is now available as an online database. More than 50 years of German philology are searchable electronically. The history of the discipline – critically reviewed, systematized and keyworded – is accessible online in more than 60,000 abstracts and summaries. Altogether, approximately 350,000 monographic studies, collected volumes and journals from the areas of literature, theatre studies, media studies, cultural history, and linguistics are made accessible bibliographically.

Covering 100 years of zoological research, the Handbook of Zoology Online represents a vast store of knowledge.

Hitler’s written legacy as contained in the database represents a unique source for studying Hitler’s world-view and his political ambitions. The most important resource for the database is the edition published by the Institute of Contemporary History (IFZ) titled “Hitler – Speeches, Writings, Proclamations” (1925–33). It focuses on Hitler’s speeches, by far the most effective propaganda tools for the National Socialist movement up to 1933. The edition is based on many years of research as well as a thorough evaluation of the news coverage of Hitler’s appearances as a speaker. In addition, the database contains the more than 1,700 documents from the Max Domarus edition (1932–1945) that first appeared in 1965. These documents are incorporated into a commentary that provides a chronology of events and historical background information as well as the author’s interpretations of Hitler’s political utterances. The source collection is supplemented by documentation of Hitler’s trial for high treason in 1924.

The IBR, published again since 1971 as an interdisciplinary, international bibliography of reviews, it is a unique source of bibliographical information. The database contains more than 1.70 million review citations of literature dealing primarily with the humanities and social sciences.

The bibliography IBZ has been the leading international and interdisciplinary reference work documenting academic periodical literature in the humanities, social sciences and related fields for over a hundred years. The spectrum of subjects covered is unrivalled: in no other database are academic journals from so many fields covered.

IUPAC Standards Online is a database built from IUPAC’s standards and recommendations, which are extracted from the journal Pure and Applied Chemistry (PAC). The International Union of Pure and Applied Chemistry (IUPAC) is the organization responsible for setting the standards in chemistry that are internationally binding for scientists in industry and academia, patent lawyers, toxicologists, environmental scientists, legislation, etc. “Standards” are definitions of terms, standard values, procedures, rules for naming compounds and materials, names and properties of elements in the periodic table, and many more. The database is the only product that provides for the quick and easy search and retrieval of IUPAC’s standards and recommendations which until now have remained unclassified within the huge Pure and Applied Chemistry archive.

Images of the Biblical World is a collection of hitherto unpublished photographs that documents biblical material culture and at the same time reflects the development of bible-related locations between 1952 and 2004.

The International African Bibliography Online (IABO) is a leading specialist bibliography of African Studies. It already contains 140,000 entries from the International African Bibliography published in the years 1971 to 2017. About 4,000 new entries will be added every year. The IABO can be browsed by categories and offers detailed search options.

The new peer-reviewed reference resource Linguistic Minorities in Europe Online (LME) provides comprehensive documentation of indigenous and immigrant linguistic minorities in Europe.

The database Nietzsche Online provides researchers and readers complete online access to the editions, interpretations and reference works on one of the most important philosophers. Users thus obtain access to a comprehensive database containing the research results of the last forty years. In addition to the authoritative editions of the works (KGW) and the letters (KGB), Nietzsche Online contains all De Gruyter publications on Nietzsche; furthermore, the database also includes contributions of the journal New Nietzsche Studies. Due to the cross-referencing to the full texts and the further interpretations, the headwords of the Nietzsche dictionary have become an even more indispensable basis for the research and understanding of Nietzsche's work.

Germanische Altertumskunde Online (GAO) provides a unique Online Reference representing the current state of knowledge of Old Germanic History, which includes Germanic and Northern European cultural history from the subject areas of history, archaeology, art history, legal history, ethnology, and religious studies. This Online Reference Work contains the complete data of the Reallexikon der Germanischen Altertumskunde, as well as new and revised articles; furthermore, all volumes of the RGA-E series (the supplementary volumes to the "Reallexikon"; currently more than 90), several journal articles, and single books.

The database The Diaries of Joseph Goebbels Online contains transcriptions of all handwritten documents from 1923 to July 1941, as well as subsequent writings that were dictated up to 1945.

The Theologische Realenzyklopädie (TRE) [Theological Encyclopedia] is a modern specialist encyclopaedia comprising 36 volumes of text (1976–2004) representing the present state of theological research as a whole. More than a generation of scholars have collaborated in its production, to create a unique internationally-oriented reference work containing more than 2,500 articles (on over 28,000 pages of text) which stands as a document of the history of scholarship. The TRE is an indispensable tool for research, study and teaching, principally in theology, but also in its neighbouring disciplines such as history, philosophy, Jewish studies and religious studies.

The Thesaurus Linguae Latinae (TLL) Online is the largest and most detailed Latin dictionary in the world. With extensive and detailed entries covering the classical period up to about 600 A.D., it is also the first of its kind on the market. This encyclopedic database, based on the renowned print dictionary of the same name, is designed to serve as an ideal tool for both research and teaching preparation at the primary and university school levels.

The Online Reference Treasury of Linguistic Maps presents linguistic maps selected from various atlases and other publications that have been published over the years by De Gruyter Mouton and other De Gruyter imprints. For the first time, this material is made available and searchable in one place and in a new, improved format. All maps have been scanned in high-resolution for maximum quality and enriched with detailed metadata. Thanks to specific search functionalities (e.g. category/subdiscipline, language described in the map, geographical location, period described), Treasury of Linguistic Maps is a unique and indispensable resource for visualized information on various topics in linguistics. Many of these maps have not been digitally available before, and some are difficult to find even in printed form. The map interface allows zooming in on details, printing, and PDF export.

The research database Vossische Zeitung Online, 1918–1934 contains approximately 10,500 issues of the oldest and most renowned Berlin daily newspaper, with a total of some 127,000 full text pages.

The basis for searches in WBIS Online is the World Biographical Index (WBI), representing a complete index to the 58 Biographical Archives, that are available in digitized format in WBIS Online.