Title of the page Where registration link
1. Islamic manuscripts reference library no
      Notes on preceeding link: it contains the 5 volumes of GRAF, GCAL and many other resources
2. Hathi Trust's digital library no
      Notes: you can find a lot of catalogues of manuscripts of different libraries.
3. Europeana no
      It contains a lot of material including manuscripts
4. Gallica no
      It contains a section also with manuscripts
5. Bayerische Staatsbibliothek no
      It contains a lot of digitized old books sometimes in collaboration with google so that you will find the same books also on google books