Syncios - Syncios is an all-in-one solution that enables users to manage their phone data, back up their data on the computer, and restore it when required.
Filza File Manager - Explore files and folders with list view or grid view. View / edit files with powerful viewers.
iMazing - iMazing lets you transfer music, files, messages, apps and more from any iPhone, iPad, or iPod to a computer, Mac or PC. Manage and backup your iOS device simply without iTunes. (was DiskAid)
Documents by Readdle - A central hub for all your files.
i-FunBox - General file management software for iPhone and other Apple products
FileApp - FileApp is an iPhone and iPad File System and Document Viewer.