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.
GoodReader - With GoodReader on your iPhone, iPod Touch or iPad, you can read virtually anything, anywhere.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
FileApp - FileApp is an iPhone and iPad File System and Document Viewer.
Wondershare PDFelement - All-in-one PDF editor