Onyx for Mac

Since 2003, Titanium Software has been issuing its free system maintenance and tweaking utility, Onyx for every major release of macOS. Currently there is a mature version of Sonoma and a beta version of Sequoia, although you can still download versions going all the way back to Jaguar, Mac OS 10.2. 

The current version of Onyx features a whole suite of features:

• Verify The Structure of the System Files 
• Run Miscellaneous Maintenance and Cleaning Tasks
• Configure Parameters in The Finder, Dock, Safari, And Some Apple Applications
• Delete Caches
• Remove Certain Problematic Folders and Files
• Rebuild Various Databases and Indexes

A few other things you can do include:

• Delete old media libraries and Xcode files
• Access all of the UNIX man files on your system
• Granular wake, sleep and shut down controls
• Provide easy access to hidden system utilities like Directory Utility and Wireless Diagnostics
• Change the visibility of files, folder and applications
• See status and toggle security tools like Gatekeeper and Firewall
• Advanced file finding
• Info and reports on hardware, memory, volumes and software

Onyx is signed by Titanium Software and notarized by Apple. It is available for downloading from the developer's website.