1-2-3 PieCharts, easy as 1-2-3!, is a cool new 3D animated java piechart that loads extremely fast, offers you extreme customizability, and offers you great features! This demo version supports exactly 5 pie slices. (Scroll down below to see full version features). In this demo version, you can click on the piechart, then drag left or right to move the piechart, or press the arrow keys (or SHIFT-and arrow keys) to apply special transformations,

SC-DiskInfo is a disk space usage analyzer. This program will track down those folders and files that are using most disk space so you can remove unwanted data and clean up your drive effectively. It displays details, including number of subdirectories, file count and overall size, as well as a graphical chart display to quickly spot the largest folders. SC-DiskInfo is very fast and easy to use. It is compatible with Windows 2000/XP/2003.

See how your computer is performing in a variety of different graphical formats. It can also be used as a screen saver. You can monitor such details as memory, disk space, disk usage, CPU usage, internet data rates etc. The graphical formats available are highly customizable and you can mix and match to get the display you want.

Disk Space Inspector is a feature-packed, yet easy to use, hard disk space analysis and disk space reporting software.
Features summary:
-View disk space usage by NTFS owner on a selected volume and/or directory to determine who is using the most space on a given volume;
-View disk space usage by shared folders.
-Graphically analyze disk space usage using Pie Chart and Bar Chart tools
-Report disk space usage as text files(XML,CSV,HTML)

WIndows Disk Housekeeping and Cleaning Utilities. These 2 applications enable you to answer the question: "where has all my disk space gone?", and once answered, the disk space can be quickly and easily reclaimed. DiskUsage & DiskClean are distributed together as one utility package.

diskSpace Explorer 3 Home Edition is a software tool for managing your hard disk space, and ensuring that you are making the most of the space you have. It helps you explore your files and folders, find wasted space and useless items, and free up valuable space. diskSpace Explorer features an intuitive interface, a pie chart that graphically displays the contents of your hard disk, and options to help you increase your available disk space.

Free network disk usage monitoring for Windows servers and workstations. Automatically scans your network for disks and adds them to your monitoring dashboard. Smart scheduling minimizes network load. The monitoring dashboard supports automatic sorting, has a configurable layout, and displays an intelligent graphical usage bar for all disks based on default warning and maximum levels. No trial period and no functionality restrictions

DiskAudit idenifies the usage of disk space on a multi-user Windows PC, with NTFS partitions. For each user, the program summarizes the total number of files and directories, as well as the total disk space used. Then, the program summarizes disk usage for common folders.

DiskAudit/2 identifies the usage of disk space on a multi-user Windows PC. For each user, the program summarizes the total number of files and directories, hidden, system, and common files and folders used. The program provides graphical displays of usage. It also reports on the largest files on the PC, as well as seldom used files.

Disk Piecharter for Windows is a Graphical Disk Explorer that shows disk usage per file and per directory in a piechart. You can zoom in and out on piechart segments (directories). You can also delete files and directory trees with it. Then it immediately shows the effect on free diskspace.