Adobe Reader - Adobe Acrobat Reader is a free tool for viewing documents that have been stored in Adobe's Portable Document Format (PDF).
Filza File Manager - Explore files and folders with list view or grid view. View / edit files with powerful viewers.
SysTools OST Viewer - Free Outlook OST Viewer Software is used to open OST file with attachments. OST Reader Tool provide a complete solution to view corrupted, orphaned OST files.
Documents by Readdle - A central hub for all your files.
PDF Reader Pro - PDF Reader Pro is an all-in-one PDF office supporting to Read, Annotate, Edit, OCR, Convert, Create & Fill Form, Sign PDFs, TTS on Mac, iOS, Android, and Windows.
FileApp - FileApp is an iPhone and iPad File System and Document Viewer.