...

Extracted list from <http://www.takecontrolbooks.com/maintaining-mac>:

Oliver likes this one, which is commercial-quality, but still free:

• OmniDiskSweeper: http://www.omnigroup.com/products/omnidisksweeper/ (free)

Other options, with notes from Oliver:

• DaisyDisk: http://www.daisydiskapp.com/^{Image Removed} ($9.95)
• Disk Inventory X: http://www.derlien.com/^{Image Removed} (free) Note date of last refresh: 2005-10-09, as of March 2013. BUT, works great with 10.8 iMac. Shows folder size, too.
• GrandPerspective: http://grandperspectiv.sourceforge.net/^{Image Removed} (free) JDiskReport: See http://jgoodiesgrandperspectiv.sourceforge.comnet/HelpDocumentation/GrandPerspectiveHelp.html. Required me reduce10.8's default security setting in order to launch application (since not signed). Didn't show folder size.
• JDiskReportfreeware/jdiskreport/^{Image Removed} (free)OmniDiskSweeper: http://wwwjgoodies.omnigroup.com/productsfreeware/^{Image Removed}omnidisksweeperjdiskreport/ (free) Downloaded file reported as broken when tried on 10.8 iMac, March 2013.
• WhatSize: http://id-design.com/software/whatsize/^{Image Removed} ($12.99)

Take Control ebooks

If you are interested in buying the ebook cited above, "Take “Take Control of Maintaining Your Mac, Second Edition", it's Edition”, it’s available for $10 here:

http://www.takecontrolbooks.com/maintaining-mac

Disclosure: Oliver performs contractual work for the publishers of this title. He welcomes your questions about Take Control's many other titles and services, of course

Keywords: Mac, size, usage, disk, hard drive.