Mac: There are quite a few handy tools for analysing your Mac's disk space, but they're all pretty complex. Disk App simplifies things to make it easy to clear up space on your hard drive.
Disk App is just about cleaning up space on your hard drive and it does so as simply as possible. When you launch the app, you'll give it a couple of directories to scan, then Disk App shows you a pie chart breakdown of what's taking up space on your hard drive. From there you can select a piece of the pie, delete old files, sort through larger files, and clean up caches. It's not super-advanced, but if you just want to quickly clear up some space on your hard drive, Disc App makes it easy.