What are some alternatives?
When comparing SpaceSniffer and WinDirStat, you can also consider the following products
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.
Baobab - Distributor of workload automation, financial statement reporting, data access, IT Asset Management and Service Desk software solutions.
TreeSize - TreeSize tells you where precious disk space has gone to.
DaisyDisk - DaisyDisk is a disk analyzer tool for OS X that visualizes hard disk usage and allows to free up hard disk space.
SpaceMonger - SpaceMonger helps you understand what's occupying your hard drive and more effectively clean it up without worrying about losing anything important in the process.
JDiskReport - JDiskReport enables you to understand how much space the files and directories consume on your disk...