Files - Keep everything organized without breaking your flow. Dropbox brings your files together, in one central place. They're easy to find and safely synced across all your devices—so you can access them anytime, anywhere.
iStorage 2HD - For its simple user interface and the advanced way of working, iStorage 2HD is simply the ultimate file manager and organizer for the iOS devices.
Filza File Manager - Explore files and folders with list view or grid view. View / edit files with powerful viewers.
FileBrowser - FileBrowser is a multifunctional file manager for the iOS devices that are used for accessing files in both local and networked environment.
FileApp - FileApp is an iPhone and iPad File System and Document Viewer.
Files-finder edition - If you have to name one app which you miss most on your iPad, what would that be?