OnyX
The free veteran that has maintained Macs since 2003
About OnyX
OnyX has been maintaining Macs since 2003, and a rebuilt version still lands with every macOS release — a level of consistency almost nothing else in this category can claim.
It clears caches, runs maintenance scripts and exposes hidden system settings that would otherwise need Terminal commands. Power users treat it as a first-aid kit for a misbehaving Mac.
It is completely free, no strings attached. Download the exact build for your macOS version from the developer's site and you're set.
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