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https://addons.mozilla.org/de/firefox/addon/ocdownloader-extension/

A Calendar app for Nextcloud

Nextcloud app that allows you to manage your OTP (TOTP/HOTP) codes easily

Store, manage and access all your passwords with ease.

A multi-format browser-based ebook reader which supports EPUB, PDF and CBR/CBZ

Ebook viewer that supports EPUB/CBZ/PDF

A multi-format browser-based ebook reader, supports EPUB and CBR/CBZ

Text recognition for your images

A pdf viewer for Nextcloud