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