The Houtsma and Littmann Collections constitute Princeton's holdings of the al-Madani library and are the focus of an ongoing three year digitization initiative that commenced in the Fall of 2021 and was completed in 2024.

Manuscripts of the Islamic World offers a curated selection of extraordinary manuscripts hosted or held by Princeton University Library. The manuscripts are predominantly in Arabic, but there are also many in Persian and Ottoman Turkish. The manuscript digitizations here are a fraction of the full Manuscripts of the Islamic World collections, housed in Special Collections in Princeton's Firestone Library. Efforts are ongoing to make the manuscripts of these collections more accessible through conservation, catalog record updates, and digitization.

The private manuscript libraries of Yemen, estimated at 50,000 codices, constitutes the largest and most important set of unexamined Arabic manuscripts in the world today. The Yemeni Manuscript Digitization Initiative presents, for the first time, access to manuscripts from three private libraries in Sanaa, Yemen, and virtually conjoins them to additional Yemeni manuscripts held by the Princeton University Library and Staatsbibliothek, Berlin.