Ghost Commander is a two panels file manager like Norton|Midnight|Total Commander.
Unlike regular file managers, it copies and moves files between its two panels, not that explorer - like copy and paste. Aside the sdcard file system, it can connect to a FTP server, access Windows (aka Samba) network shares (with a plug-in), open and extract ZIP archives.
Also features: multiselect, pictures thumbnails, favorites, occupied space calculation, search, text editor (built-in or external), open file with appropriate application (f.e. install an .apk), send files via email or bluetooth, custom colors, custom interface language, etc.