Droid Transfer - Save and Print your Android Phone Messages, Manage Photos, Music and other files on your Android Phone through your PC. Android Transfer Software.
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
AirDroid - Access Android phone/tablet from computer remotely and securely. Manage SMS, files, photos and videos, WhatsApp, Line, WeChat and more on computer.
WizTree - WizTree quickly finds the files and folders using the most space on your hard drive. It scans the MFT (Master File Table) instead of crawling the entire disk which makes it very fast.
Coolmuster Android Backup Manager - Coolmuster Android Backup Manager is the one-stop backup and restore software for Android data, which enables you to back up and restore Android data with 1 click, such as contacts, SMS, call logs, media files, etc.
TreeSize - TreeSize tells you where precious disk space has gone to.