Space Gremlin is another good one for OS X. and it feels a little more &quot;Nativey&quot; than Disk Inventory X (which I&#x27;ve also used and is also good).<p><a href="http:&#x2F;&#x2F;www.spacegremlinapp.com&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.spacegremlinapp.com&#x2F;</a>