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.
Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
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.
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.