The number of rare books available on-line increases daily. Although it is difficult to keep track of what is available in which place(s), this list indicates the most important libraries and/or digital collections for Bibliotheca Sinica 2.0.
- ALO – Austrian Literature online
- archive.org – Internet Archive
- BHL – Biodiversity Heritage Library
- BHL – Biodiversity Heritage Library
- BioLib – Max Planck Institute for Plant Breeding Research, Cologne, Germany
- BIUM – Bibliothèque interuniversitaire de Médecine, Paris
- BNP – Biblioteca nacional de Portugal
- Botanicus.org – portal to historic botanical literature from the Missouri Botanical Garden Library
- BSB – Bayerische Staatsbibliothek (Digitale Sammlungen)
- BUMP – Bibliothèque Universitaire Moretus Plantin (Namur)
- BVH – Bibliothèques Virtuelles Humanistes (Univ. Tours)
- BVPB – Biblioteca Virtual de Patrimonio Bibliográfico
- CAMENA – Corpus Automatum Multiplex Electorum Neolatinitatis Auctorum (Latin Texts of Early Modern Europe )
- Clark (Sterling and Francine Clark Art Institute) http://www.clarkart.edu/library/digital-collections.cfm
- dlib.si – Digitalna knjžinica Slovenije (Digital Library of Slovenia)
- e-rara.ch – e-rara.ch | Part of “Elektronische Bibliothek Schweiz”
- ECHO – European Cultural Heritage Online
- EDBO – Early Dutch Books Online
- ENPC – École nationale des ponts et chaussées
- gallica – Bibliothèque numérique GALLICA de la Bibliothèque nationale de Frac
- GDZ – Göttinger Digitalisierungszentrum
- GentU – Universiteitsbibliotheek Gent
- Google Books
- HAAB – Herzogin Anna Amalia Bibliothek Weimar
- Harvard OCP – Harvard University Library | Open Collection Program
- HATHI Trust
- HKU – University of Hong Kong Libraries, Digital Initiatives
- ИВР РАН Санкт-Петербургский Институт Восточных Рукописей Российской Академии Наук
- Laures Rare Books Virtual Library – Laures Rare Books Database and Virtual Library, Kirishitan Bunko, Sophia University (Tokyo)
- LCL | DC – Lafayette College Libraries | Digital Collections (Easton, PA)
- LOC – Library of Congress
- MEK – Magyar Elektronikus Könyvtár
- NLA – National Library of Australia
- NYPL – New York Public Library Digital Gallery
- Open Library
- OAG Tokyo – Deutsche Gesellschaft für Natur und Völkerkunde Ostasiens/Tokyo, Digitale Bibliothek
- PôLib – Bibliothèque numérique patrimoniale – Universités Lille 1, Lille 2 et Lille 3
- Polona – cBN Polona – National Digital Library (Poland)
- purl.pt – Biblioteca Nacional de Portugal | Colecções digitalizadas
- QUB – Queen’s University Belfast, Digital Special Collections and Archives
- RACHEL – Le Réseau européen des bibliothèques judaica et hebraica
- RJB Madrid – Digital Library/Royal Botanical Garden, Madrid
- SBB – PK – Staatsbibliothek zu Berlin – PK
- SICD – Service Commun de la Documentation University of Strasbourg – Digital old books
- Toyo Bunko – Toyo Bunko Rare Books
- UAlberta – University of Alberta
- UAlicante – University of Alicante
- UB Augsburg – University of Augsburg | Library
- UB Bremen – Staats- und Universitätsbibliothek Bremen (Digitale Sammlung Deutscher Kolonialismus)
- UB Heidelberg – Ruprecht-Karls-Universität Heidelberg
- UBVU Amsterdam – Universiteitsbibliotheek Vrije Universiteit Amsterdam
- UCM – Biblioteca Complutense | Colección Digital Complutense (Madrid)
- UDelhi – Digital Library@University of Delhi
- UGeorgia – University of Georgia Libraries
- UGranada – Universidad da Granada
- ULB Sachsen-Anhalt – Universitäts- und Landesbibliothek (ULB) Sachsen-Anhalt | Martin-Luther-Universität Halle-Wittenberg
- ULBD – Universitäts- und Landesbibliothek Düsseldorf
Universidad de Sevilla – Library of the University of Sevilla
- UWDC – University of Wisconsin / Digital Collections
- WBC – Wielkopolska Biblioteka Cyfrowa
- WDB – Wolfenbütteler Digitale Bibliothek
- WDL – World Digital Library