Sirius - An open-source clone of Siri from UMICH

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

Applied Software - Prepare to work with an industry champion! Applied Software specializes in bridging the technology divide from product to productivity no matter your industry.

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.

Ingram Micro - Delivering global technology and supply chain services to support cloud aggregation, data center management, logistics, technology distribution, mobility device life-cycle and training.

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.