A list of useful links to archives and libraries online.
Biblioteca Nacional Digital da BNL
The digital library of the Portuguese national library. Plenty of material, mainly rare books, but some interesting manuscripts as well.
Biblioteca Nacional Hispánica – http://www.bne.es/es/Catalogos/BibliotecaDigitalHispanica/Inicio/index.html
Spanish digital library, gathers material from many different Spanish-speaking countries.
Portal de Archivos Españoles
Spanish government portal gathering material from various different archives in Spain, including the Archivo General de las Indias, in Sevilla.
Biblioteca Pedro Arrupe
A precious site ran by the city of Palermo gathering PDFs of many Jesuit books, including rare materials and contemporary out of print books.
Post-Reformation Digital Library
A very thorough site on theological and philosophical rare books, gathered from large libraries, Google Books, and other web-based services.
Gregorian Archives Texts Editing (GATE)
A collaborative project developed by the Historical Archives of the Pontifical Gregorian University (APUG), it has more than more than 6,000 manuscripts written by Jesuits since 1551 until today.