Fily is a filebrowser (and editor) for iOS 8 and up. You can use it to view Apples applications or modify text files or use it as a Finder for iOS.
Because Fily is still in development only text files can be edited for now, but other files will be added in the future.
Because of Apples restrictions you can not modify files in your Root directory if you are not jailbroken, but you can however modify, delete or move files in your documents directory.
WARNING: I am not responsible if you delete essential files from your iDevice.