WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
TreeSize - TreeSize tells you where precious disk space has gone to.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
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.
LightShot - The fastest way to take a customizable screenshot.