KDAN Mobile PDF Reader - PDF Reader is the one app you can rely on when you need a portable solution to work with PDFs.
Documents by Readdle - A central hub for all your files.
Jotform - Free Online Form Builder & Form Creator
FileApp - FileApp is an iPhone and iPad File System and Document Viewer.
Pdf.to - Convert PDF to Word, Excel, JPG, & from. Also compress PDF
FE File Explorer - The one-stop files solution