FolderMount Premium [ROOT] v2.9.7b
Requirements: 2.3+
Overview: FolderMount – Link folders from internal SD to external to free space

ROOT is required. Without it, the app will not launch.
Problems? Use the EMAIL DEVELOPER link in the Play Store.
Today some apps store big... http://www.apkformod.com/foldermount-premium-root-v2-9-7b/