Katiba of Muhammad bin Nusayr is a digital religious library dedicated to making books and manuscripts available for online reading and download. Its collection focuses on Alawite-Nusayri esoteric writings and Shiite works on hadith and biographical evaluation, with an advanced search feature to help visitors explore the catalogue by title or author. The website presents its interface in Arabic, English, French, and Persian.

The library offers 219 books across subjects including esoteric traditions, Shiite hadith, theology, religious debate, history and biography, philosophy, wisdom, worship, Quranic interpretation, poetry, and personal refinement. Visitors can browse curated sections for esoteric and exoteric works, consult book details such as authors and subject categories, and download available titles. The collection includes writings by a range of named authors and scholars, as well as works whose authors are unidentified or described as believers. Katiba also provides 14 audiobooks, extending access beyond its digital text collection. Overall, the platform serves readers seeking a searchable, subject-organized resource for religious texts and manuscripts.