Documents by Readdle - A central hub for all your files.
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)
FileApp - FileApp is an iPhone and iPad File System and Document Viewer.
plist Editor - Reads and writes both text and binary .plist files.
FE File Explorer - The one-stop files solution
Decipher Backup Repair - Repair and restore corrupt iPhone backups. If you are getting the error message "iTunes / Finder could not restore the iPhone because the backup was corrupt" then Decipher Backup Repair can help!