Kiwi application monitor - Kiwi application monitor is a small program which lets you monitor your applications/processes, Windows and User activity.
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Battle Encoder Shirase - Software that controls per-process CPU usage: an “active” software CPU cooler.
TreeSize - TreeSize tells you where precious disk space has gone to.
Processes - https://www.oneperiodic.com/products/processes/
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.