Documents by Readdle - A central hub for all your files.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
Documents Pro 7 - The ultimate all-in-one mobile office suite for the iPhone and iPad with 8 premium apps in 1.
Wondershare PDFelement - All-in-one PDF editor
FE File Explorer - The one-stop files solution
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.