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

MemberVault - MemberVault is a flexible platform that helps you to create, deliver, and sell your services, courses, memberships, subscriptions, etc.

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

Ruzuku - Ridiculously easy online courses

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.

Opentute - Opentute helps businesses to effortlessly launch a private eLearning and communication platform to engage teams and clients.