diskonaut

Terminal disk space navigator

How does it work? Given a path on your hard-drive (which could also be the root path, eg. /). diskonaut scans it and maps it to memory so that you could explore its contents (even while still scanning!). Once completed, you can navigate through subfolders, getting a visual treemap representation of what's taking up your disk space. You can even delete files or folders and diskonaut will track how much space you've freed up in this session.