Academic Search Ultimate by EBSCO, offers students an unprecedented collection of peer-reviewed, full-text journals, including many journals indexed in leading citation indexes. The combination of academic journals, magazines, periodicals, reports, books and videos meets the needs of scholars in virtually every discipline ranging from astronomy, anthropology, biomedicine, engineering, health, law and literacy to mathematics, pharmacology, women’s studies, zoology and more

ACM Digital Library provides searching facilities to all publications issued by the Association for Computing Machinery, which cover subject areas such as: computer science, applied mathematics, biomedical engineering, electronics and mechanical engineering, operations research and information technology in general. Access is available to the full text of more than 1100 titles that the Library holds subscription, among which scientific journals and conference proceedings.

The ACS Publications platform is designed to offer search facilities to the publications of the American Chemical Society, mostly related to chemistry. It includes  peer-reviewed journals, books, reference material and reports since 1879 and the access is possible to the full text of approximately 47 journal titles.

Subject Coverage: chemistry, chemical engineering, physics, biology, biotechnology. 

ADS is a NASA-funded project offering search services in 3 bibliographic databases related to Astronomy, Physics and preprints in Astronomy (ArXiv). It provides searchable records and selected full-texts of astronomical literature and access or pointers to external resources, such as articles, data catalogs etc.

Search is also available through a modern form: https://ui.adsabs.harvard.edu/ 

Subject Coverage: Astronomy, Astrophysics, Planetary Science, Solar Physics, Physics, Geophysics.

AGRICOLA bibliographic database, is produced by the National Agricultural Library and consists of worldwide literature citations for journal articles, monographs, proceedings, theses, patents, translations, audiovisual materials, computer software, and technical reports pertaining to all aspects of agriculture and related fields since 1970.

Useful tips for effective bibliography searching is available: AGRICOLA Help

The American Society for Microbiology (ASM) provides search facilities to ASM journals  covering  the discipline of basic and clinical microbiology. Access is possible to the full text by default (open access titles), 6 months after publication (primary research journals), or 1 year after publication (review journals).

Art Index features high-quality indexing of over 600 periodicals, more than 13,000 art dissertations, and almost 200,000 art reproductions, providing examples of styles and art movements, including works by emerging artists. The database includes a database-specific thesaurus and covers fine, decorative and commercial art, as well as folk art, photography, film, and architecture.

Art Index Retrospective: 1929 -1984 provides users access to over half a century of art literature covering fine, decorative, and commercial art. Content includes high-quality indexing of nearly 600 publications, many of which are peer-reviewed, and citations of over 25,000 book reviews.

Arts & Humanities Citation Index is a multidisciplinary database indexing 1.663 arts and humanities journals. It provides access to current information and retrospective data from 1975 to the present and the subject areas covered are: archaeology, architecture, art, asian studies, classics, dance, folklore, history, linguistics, literary reviews, literature, music, philosophy, poetry, radio, television & film, religion, theater. (Alternative access through NDC).

ArXiV is created and maintained by the Cornell University and it is the first open access electronic archive with research articles. It started in August 1991 and provides access to the full text.

Subject Coverage: physics, mathematics, computer science, nonlinear sciences, quantitative biology, quantitative finance, statistics.

It is one of the world's most voluminous search engines especially for academic web resources and is operated by Bielefeld University Library. It hosts metadata of all kinds from more than 5.000 academically relevant resources - journals, institutional repositories, digital collections etc and provides more than 100 million documents. The full texts of about 60% of the indexed documents can be accessed without restriction.

The Brill Dictionary of Ancient Greek  is the English translation of Franco Montanari’s  Vocabolario della Lingua Greca . With 140,000 entries this is the most important modern dictionary for Ancient Greek and an invaluable tool for students and advanced scholars alike.

Brill's Companions to Classical Studies  is an expanding series of handbooks on a wide variety of subjects and persons from Classical Antiquity, and their reception in European culture. The companions provide a graduate-level synthesis of debate and the state of scholarship on the subjects. Designed for students and scholars, the books explain what sources there are, what methodologies and approaches are appropriate in dealing with them, what issues arise and how they have been treated, and what room there is for disagreement. 

Cambridge Core is the home of academic content from Cambridge University Press, with over 1.8 million journal articles and 46,000+ books  in a variety of subject areas.

The Comprehensive Repository of Validated and Curated Small Molecule Organic and Metal-organic Crystal Structures

Established in 1965 with historical structures dating back to the 1920s, the Cambridge Structural Database (CSD) now contains over 1.1M accurate 3D structures with data from X-ray and neutron diffraction analyses and additional curation from the CCDC. The database is used by researchers across the pharmaceutical, agrochemical, and fine chemicals industries to predict and guide future discoveries.

Fully discoverable and accessible, the CSD is an essential trusted scientific resource giving big-data insights using powerful algorithms for molecular analysis. A CoreTrustSeal certified data repository.

Organic crystal structures include:
 Drugs and pharmaceuticals
 Agrochemicals
 Pigments
 Explosives
 Protein ligands.

Metal-Organic crystal structures include:
 Metal Organic Frameworks (MOFs)
 Models for new catalysts
 Porous frameworks for gas storage
 Fundamental chemical bonding.

Features

Validated chemical representation
Fully discoverable and trusted, the experimental data is further curated to include data from additional sources - for example common names, bioactivity, natural source, cross-reference to other enantiomers or racemates or polymorphs. This additional data allows easy grouping further enhancing discoverability and value as a knowledge base. Disordered structures are clearly represented owing to CCDC curation.
Fully empirical
Real world data brings trusted data insights and science to life for teaching.
Greater than the sum of its parts
The data from a collection of 1.1M structures can be compared, analysed and grouped to show common themes, trends and guides for further analysis and experimentation. Almost infinitely more valuable than the individual structures in isolation.
Interoperable and re-usable
All electronically deposited structures have their own DOI which helps for FAIR principles of interoperability and re-use of data.
Search and extract knowledge
CCDC software enables scientists to work with the CSD structural data to extract new insights. This includes public and proprietary, experimental and predicted data.
Target searches to structures of interest
Pre-calculated subsets of the CSD for specialist areas of chemistry that allow researchers to target searches to structures of interest.

The CAS SciFinder Discovery Platform™ consists of three core solutions:

1.         CAS SciFinder, for searching and analyzing information,

2.    CAS Analytical Methods™, for discovering published scientific methods, and

3.    CAS Formulus®, for evaluating ingredients and regulatory information for product development.

It provides instant access to chemical substances (structures, names, properties, regulatory information) and reaction information (schemes, step-by-step procedures, conditions, and yields) from authoritative sources.

It offers real-time retrosynthetic design for exploring predictive and experimental synthetic routes, as well as access to hundreds of thousands of published analytical methods.

To activate the CAS service, you need to create an account on the service platform with your institutional email address and through the University of Crete network. (To register, follow the link: Online Registration:New User).

  Access is provided through the Hellenic Academic Libraries Link: https://www.heal-link.gr/en/bibliographic-full-text-databases/

Computing Research Repository is a subset of ArXiv and includes publications related to computing research. It was created through a partnership of ACM, the ArXiv.org e-print archive and NCSTRL and provides open access to the scientific publications.

Dblp computer science bibliography provides bibliographic information on major computer science publications, open access to high-quality metadata and links to the electronic publications. It indexes more than 3.3 million publications, in more than 2.000 journal volumes, 31.000 conference proceedings and 23.000 monographs.

De Gruyter is one of the world’s largest and most reputable humanities publishers while extending to subject areas like natural and social sciences, economics, technology, mathematics, architecture, design and more. It publishes over 120 gold open access journals and distributes the complete digital collections of some of the world’s most renowned scholarly presses.

It includes more than 7.000 open access scientific journals of multiple disciplines. It is possible to search articles and in all cases directly access the full text.

The DSI Statistical Compendium - OECD Selection is an essential reference work for all those who could benefit from having a macroeconomic overview of the economies of the OECD (Organization for Economic Co-Operation and Development) Member countries. It includes 1 million+ monthly, quarterly and annual time series, with a historical time span from 1960 up to these days, and comparable data for all 29 OECD Members.

https://www.oecd-ilibrary.org/statistics

The  Encyclopedia of Ancient Greek Language and Linguistics  (EAGLL) is a unique work that brings together the latest research from across a range of disciplines which contribute to our knowledge of Ancient Greek. It is an indispensable research tool for scholars and students of Greek, of linguistics, and of other Indo-European languages, as well as of Biblical literature.

Espacenet offers free access to more than 70 million patent documents worldwide, containing information about inventions and technical developments from 1836 to today.

This new bibliographic database is a valuable index for libraries, scholars and individuals interested in European works that relate to the Americas. EBSCO Publishing, in cooperation with the John Carter Brown Library, has created this resource from “European Americana: A Chronological Guide to Works Printed In Europe Relating to The Americas, 1493-1750,” the authoritative bibliography that is well-known and respected by scholars worldwide. The database contains more than 32,000 entries and is a comprehensive guide to printed records about the Americas written in Europe before 1750.

Google Scholar search engine enables free search in scholarly material such as peer-reviewed papers, theses, books, preprints, abstracts and technical reports from broad areas of research. It includes a variety of academic publishers, professional societies, preprint repositories and universities and includes open access to full text and citations. Stats of resource usage are also available.

Oxford Art Online offers access to the most authoritative, inclusive, and easily searchable online art resources available today. Through a single gateway, users can access and cross-search Oxford’s acclaimed, regularly updated art reference works: the  Grove Dictionary of Art  and the  Benezit Dictionary of Artists .  Grove Art  is the foremost scholarly art encyclopedia, offering global coverage of visual culture, composed and expanded in collaboration with thousands of scholars and specialists around the world.  Benezit  offers unique information about the sale and collection of artists’ work, and it is one of the most comprehensive and definitive resources of artists’ biographies available. In addition, users can search and access Oxford art reference titles including the  Encyclopedia of Aesthetics  (2nd edition),  The Oxford Companion to Western Art,  and  The Concise Oxford Dictionary of Art Terms .

HeinOnline is a premier online research platform that provides more than 215 million pages of multidisciplinary periodicals, essential government documents, international resources, case law, and much more.
The HeinOnline Academic Core (International) package includes an entire digital library containing more than 3,200 law and law-related journals published in more than 60 different countries, alongside thousands of Australian, Canadian, and European legal materials, essential foreign legal yearbooks, and a wealth of international government publications.
Subject coverage includes:

• Constitutional Law
• Laws of the Sea
• Human Rights
• Women's Studies
• Criminal Law
• International Trade
• Education

All documents within HeinOnline are exact replicas of the original print publications, provided in a fully searchable, image-based format. The database incorporates content from trusted publishers such as Brill Nijhoff, Oxford University Press, Cambridge University Press, Sage, and more.
The platform provides unique search tools, utilizing artificial intelligence and visual aids, to make research a breeze. And for additional assistance, subscribers can visit HeinOnline’s collection of help pages and libguides.

More info and detailed list of the databases included in the package, here.

HeinOnline is a premier online research platform that provides more than 215 million pages of multidisciplinary periodicals, essential government documents, international resources, case law, and much more.
The HeinOnline Academic Core (International) package includes an entire digital library containing more than 3,200 law and law-related journals published in more than 60 different countries, alongside thousands of Australian, Canadian, and European legal materials, essential foreign legal yearbooks, and a wealth of international government publications.
Subject coverage includes:

• Constitutional Law
• Laws of the Sea
• Human Rights
• Women's Studies
• Criminal Law
• International Trade
• Education

All documents within HeinOnline are exact replicas of the original print publications, provided in a fully searchable, image-based format. The database incorporates content from trusted publishers such as Brill Nijhoff, Oxford University Press, Cambridge University Press, Sage, and more.
The platform provides unique search tools, utilizing artificial intelligence and visual aids, to make research a breeze. And for additional assistance, subscribers can visit HeinOnline’s collection of help pages and libguides.

More info and detailed list of the databases included in the package, here.

The International Aristotle Bibliography Online  is a comprehensive research tool and gives access to books, articles, book reviews and dissertations on the philosopher Aristotle.  The International Aristotle Bibliography Online  covers more than 100 years of publication. It presents an invaluable resource for all those interested in (ancient) philosophy. Under the continued editorship of Richard Ingardia, the bibliography will be updated with hundreds of the most recent publications, as well as with additional entries from previous years.

IOP Science platform of the publisher Institute of Physics, offers easy access to the full text of journals and books that publishes, with scientific, technical and medical content. Access is possible to more than 100 titles of scientific journals.

Subject Coverage: Atomic and molecular physics, earth and environment, optical physics, materials, physics education, semiconductors, superconductivity, super-resolution microscopy, biosciences, mathematical physics, measurement and instrumentation, quantum technology

It offers bibliographic search in the databases

• Science Citation Index Expanded (SCI-EXPANDED) --1970-present
• Social Sciences Citation Index (SSCI) --1970-present
• Arts & Humanities Citation Index (A&HCI) --1975-present
• Emerging Sources Citation Index (ESCI) --2015-present

Access to the abstracts and the citations of the articles are available.

Journal Citation Reports is a comprehensive resource that allows to evaluate and compare journals (Impact Factor) using citation data drawn from over 10.500 scholarly and technical journals of all the areas of science, technology, and social sciences.

he Digital Fragmenta Historicorum Graecorum (DFHG) is the digital edition of the five volumes of the Fragmenta Historicorum Graecorum (FHG) produced by Monica Berti at the Alexander von Humboldt Chair of Digital Humanities at the University of Leipzig.

The FHG consists of a survey of excerpts from many different sources pertaining to 636 ancient Greek fragmentary historians. Excluding the first volume, authors are chronologically distributed and cover a period of time from the 6th century BC through the 7th century CE. Fragments are numbered sequentially and arranged by works and book numbers, when these pieces of information are available in the source texts preserving the fragments. Almost every Greek fragment is translated or summarized into Latin. The Müller-Jacoby Table of Concordance allows to search correspondences among authors published in the FHG, the FGrHist, and the BNJ.