From the Biblioteka Narodowa (National Library of Poland), the site provides access to the digital collections of the Library, including the most important editions of literature and scientific materials, historical documents, journals, graphics, photography, score and maps. The site is in Polish and English, although the digitized collections are chiefly in Polish.
Staropolska On-Line, an e-library of Old Polish Literature from the Middle Ages, the Renaissance and the Baroque periods. Site is in Polish, and in a truncated form, in English.
TITUS (Thesaurus Indogermanischer Text- und Sprachmaterialien) is an international effort to gather old texts relevant to the study Indo-European, put them into electronic form and make them available via the World Wide Web. The project's site includes quite a number of texts from Old Church Slavic, Old Czech, Old Polish, Old Slovenian, Old Russian, Old Baltic languages including Prussian and Old Armenian. Also on the site are Wordcruncher Viewer software and fonts available for downloading in various encodings.