App Name: Astro File Manager
Description: Astro File Manager is one of the main file management tools available for Android devices. The main program is free. There is also a bluetooth module and a smb module that can be downloaded. With this app one can work with file management, file and/or app backup, image and text viewers, SFTP, Zip Tar, downloader, thumbnails, search files, application manager, task manager, attachments. A new version is currently being worked on.
Cost: Free / $3.99 for Pro (ad removal)
ASTRO File Manager – AndroidTapp.com (a bit old but good overview)
Android App Review: Astro File Manager (video)- Droidcell
ASTRO File Manager Reaches 15 Million Downloads as Version 3.0 is Prepared – Phandroid (press release on app)