Today some apps store big files over the internal SD card (e.g. games, podcasts, offline RSS content, pictures, videos, offline navigation software). Typically users have a small internal sd card size (~16GB) while the external SD is a lot bigger (~32-64GB)
ES File Explorer File Manager v3.2.0 - ES File Explorer is a free, full-featured file and application manager.
It functions as all of these apps in one: file manager, application manager, task killer, download manager, cloud storage client (compatible with Dropbox, Google Drive, SkyDrive, Box.net, Sugarsync, Yandex, Amazon S3, and Ubuntu One..
FolderMount 2.6.12 Full - This app has the ability to link folders in your internal sdcard to folders in your external sdcard thereby populating the internal sdcard folders with content that really exists in the external card. This helps us free space and have multiple games/apps with big data stored simultaneously without the need to uninstall
MyPhoneExplorer - Connect your SonyEricsson phone via cable, bluetooth or infrared and you'll be surprised how easy and efficient you can manage your phone with this compact software. Since its first appearance MyPhoneExplorer evolved into the most popular freeware tool for SE-phones and is constantly extended by new features