iTransfer – File Transfer Tool
iTransfer – File Transfer Tool for iPhone iPad which supports FTP, FTPS, SFTP, Cloud Drives, etc.
App
PDF Element – free PDF reader, editor, converter
PDF Element – free PDF reader, editor, converter for iOS. Open, edit, convert and sign PDF on iPhone iPad.
Calibre
Calibre is a free and open-source e-book management software for Windows, Mac and Linux that can organize, convert, and read e-books in various formats.
Owlfiles File Manager
Owlfiles File Manager for Mac, iPhone, iPad. Access files on local storage, server, NAS and cloud storages. Transfer files from any location to another. Stream movies and music to your mobile or desktop device and even more.