Ktiv: The International Collection of Digitized Hebrew Manuscripts

According to this article, the National Library of Israel has created a massive online database of ancient Jewish manuscripts and images from around the world. "The archive contains nearly 4.5 million images from 45,000 manuscripts, including prayer books, biblical texts, commentary, philosophy, literature and scientific writings in various Jewish-related languages such as Hebrew, Yiddish, Ladino and Judeo-Arabic." You can access the database here.