WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.

logit.io - Logit.io provides complete observability of logs, metrics and traces. The platform also offers alerting & monitoring, as well as Prometheus, OpenSearch & Grafana. Ingest any type of data to see real-time insights about your applications and services

TreeSize - TreeSize tells you where precious disk space has gone to.

Plumbr - Plumbr is an application performance platform that provides insights to users on the performance of their applications.

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.

AppOptics - Application performance management and infrastructure monitoring.