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
TreeSize - TreeSize tells you where precious disk space has gone to.
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.
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.