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Freely available and open access sources
- Google Scholar - search records and full text of study materials across multiple disciplines
- OpenAIRE - platform for open publishing of documents and scientific data generated within the European Commission's 7th Framework Programme for Research
Journals
Repositories and digital libraries
- The Directory of Open Access Repositories - directory of institutional repositories with freely available content from all over the world
- Repository66 - map of institutional repositories around the world with freely available content.
- Registry of Open Access Repositories - search records from institutional and disciplinary repositories
- Národní úložiště šedé literatury - technically oriented sources from Czech Republic, especially from Czech universities and the Academy of Science
- arXiv - disciplinary repository for mathematics, physics, technology and engineering; has over 700,000 documents
- RePEc - digital library maintained by volunteers that is focused on economics
- Digital Mathematic Library - a collection of freely available documents from Czech Republic focused on mathematics; offers both record and full text
- GitHub - source codes repository
Books
Catalogues a information gateways - bibliographic references searching
Norms, patents
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