Documents by Readdle - A central hub for all your files.
Apache PDFBox - The Apache PDFBox™ library is an open source Java tool for working with PDF documents.
FileApp - FileApp is an iPhone and iPad File System and Document Viewer.
IronPDF - SDK for creating and editing PDFs.
FE File Explorer - The one-stop files solution
iText - iText is an intuitive and refined text editor with word processing completely rewritten in Cocoa...