Open Source OmniDiskSweeper Alternatives for Windows
OmniDiskSweeper is not available for Windows but there are plenty of alternatives that runs on Windows with similar functionality. The most popular Windows alternative is 
WinDirStat, which is both free and Open Source. If that doesn't suit you, our users have ranked 28 alternatives to OmniDiskSweeper and 17 are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to OmniDiskSweeper are 
WizTree (Free Personal), 
TreeSize (Paid), 
JDiskReport (Free) and 
SpaceMonger (Paid).
- WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
- Free open-source cross-platform file & directory statistics as found on Github- Generate a directory tree for any given folder
- Desktop tool for interactive visualization of disk space and memory.