Austria

• Austrian National Library (ÖNB)

Belarus

• Belarusian book of the 14th - 18th centuries

Bosnia and Hercegovina

• Corpus of Medieval Bosnian Manuscripts
• Index of words and forms of the Zographou Gospel with Greek equivalents

Bulgaria

Facsimiles

• National Library of St. Cyrill and Methodius, Sofia (NBKM)
  • Slavonic manuscripts
• NALIS Repository
• University Library of St. Climent of Ohrid, Sophia
• National Library of Ivan Vazov, Plovdiv
• Bulgarian Academy of Sciences

Editions

• Scripta Bulgarica
• Cyrillomethodiana

Croatia

• Glagoljica.hr (Croatian Glagolitic manuscripts and early prints from various institutions)
• Croatian Academy of Sciences and Arts (HAZU) (just early prints)
• National and University Library, Zagreb (NSK)
• Croatian Glagolitic (a virtual exhibition)

Czechia

• Manuscriptorium (manuscripts and early prints from National Library and other foreign institutions)

Egypt

• Saint Catherine Sinai Monastery (scans of microfilms)
• via Library of Congress
• via NALIS Repository

France

• National Library of France (BNF)

Germany

• Berlin State Library
• Bavarian State Library
• Kassel University

Israel

• Greek and Armenian Patriarchate of Jerusalem

Lithuania

• Wróblewski's Library of Lithuanian Academy of Sciences

Macedonia

• Old Manuscripts in Macedonia (just samples in low quality)

Moldova

• National Library of Republic of Moldova
• Manuscripts
• Old prints

Poland

• National Library of Poland

Romania

• Library of Romanian Academy (BAR)
• Medievalia
• Byzantion (manuscript samples)
• Historical documents from BAR (acts)
• National Library of Romania (BNR)
• Slavonic Manuscripts
• Lucian Blaga Central University Library Cluj
• National Archive of Romania (acts)

Russia

Facsimiles

• Russian State Library in Moscow(RGB)
• via Trinity Lavra of St. Sergius
• via Russian State Digital Library
• f. 304.III
• Russian National Library in Saint Petersburg (RNB)
• Digitized Manuscripts
• Virtual Manuscript Expositions
• Serbian Manuscripts
• Radziwiłł Annals
• Russian State Archive of Old Acts (RGADA)
• State Historical Museum (GIM)
• Library of the Russian Academy of Sciences
• Society of Lovers of Old Literature
• Novgorod State Musem (samples only)
• 100 main documents of the Russian history
• Manuscript Texts of Old Rus (birch bark acts, annals, etc.)
• Old Rus' epigraphy

Editions

• Library of Old Rus Literature
• Manuscripts.ru
• Corpus of Old Slavic Texts from the XIth c.
• Full Colection of Russian Annals
• Slavonic-Rus Prologue according to the Oldest Manuscripts
• Byzantinorossica
• Povestʹ vremennyx let

New Church Slavonic

• Liturgical Texts
• Bible
• Bible in Civil Script

Serbia

• National Library of Serbia
• Manuscripts (samples only)
• Old Prints
• Matica Srbska
• Svetozar Marković University Library in Belgrade
• Monumenta Serbica
• Šabac Library (old prints)

Slovenia

• National and University Library (NUK)

Ukraine

Facsimiles

• Vernadsky National Library of Ukraine (NBUV)
• Ucrainica
• Vasyl Stefanyk Lvov National Science Library of Ukraine

Editions

• Izbornyk

United Kingdom

• British Library (BL)
• Slavonic Manuscripts (microfilm scans)
• Oxford Bodleian Library

United States

• • The Morgan Library & Museum (New York)

Vatican

• Vatican Library (BAV)