[Mac, iOS] Free – Disk Graph @ Apple App Store
Inspect your disk and find the files that occupy the most space or that haven’t been modified in a long time.
Any directory reachable in the Finder can be opened.
Use the context menu or keyboard shortcut to show selected files in the Finder or move them to the bin.
Open two or more similar directories to observe the changes between them in an interactive animation, or export snapshots at key moments and compare them later.
Also check out the developers free text editor app, unFocus.