Disk Cleanup

GrandPerspective

Visualises disk usage as a treemap so the biggest files and folders stand out at a glance. Free on SourceForge, paid on the App Store.

The graph it generates is satisfying to look at.

Mole

Cleans caches and logs, fully uninstalls apps with their leftovers, and analyzes disk usage on your Mac from the terminal.

The command-line tool is very simple to use. I was surprised that it cleaned 120 GB from my system. Very effective.

CLI only

SD Maid SE

Android cleaning tool: removes leftover files from uninstalled apps, clears caches and junk, finds duplicates and shows what's eating your storage.

TreeSize

Shows which folders and files take up the most space on your drives, so you can find and clean up space hogs fast.

It just works and it’s fast. Love it.