ONCE digital book manager (GOLD) is a player for DAISY books in 2.02 and 3 format, Bra books, PEF books, scores, audio magazines and Braille magazines. The books can be downloaded from the Digital Library that ONCE offers to its affiliates through ClubONCE, requiring that the affiliated person log in with their ClubONCE username and password for the first time. The app allows navigation through the content of a book, the management of personalized marks and the usual functionalities of this type of application.