WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Serv-U Managed File Transfer Server - Comprehensive security, automation, and control over file transfers in and outside your organization
TreeSize - TreeSize tells you where precious disk space has gone to.
SSHDroid - Download SSHDroid app for Android. Connect through SSH to your device!. .
SpaceSniffer - SpaceSniffer is a freeWare (donations are welcome) and portable tool application that lets you understand how folders and files are structured on your disks.
zFTPServer Suite - zFTPServer Suite is a user friendly and easy to use FTP server.