GutenPrint is now deprecated for Mac OS, as of 7 July 2024. Are there any suitable substitutions, particularly for Sonoma 17.5 on Apple Silicon?
According to GutenPrint's web page, they have deprecated "support".
https://gimp-print.sourceforge.io/index.php
In other words, there will be no new versions of GutenPrint. It doesn't mean that GutenPrint will stop working on existing installations. If GutenPrint was previously working with your setup, it should continue to work just fine, until you upgrade to some later version of the Mac OS than you currently are using, that causes the GutenPrint drivers to break. Practically that means that if you intend to keep your printer working, you should probably forego upgrading the OS on the Mac that your printer is attached to until such time as you purchase a new printer.
I don't know if the existing GutenPrint drivers will work under Sonoma. GutenPrint doesn't list them as a supported OS, but that doesn't mean that they won't work. You'll have to try them to see. That shouldn't be a problem, since they are free. You can just download them and try them. Trash them if they don't work.
When you find that the GutenPrint drivers no longer work with the version of the Mac OS that you are running, if your printer uses Postscript, or a clone of Postscript (i.e. just about all laser printers other than the very cheapest ones; but unfortunately very few inkjet printers), the Mac OS includes a generic Postscript printer driver that should work fine, at least for a printer's basic functions. (Special features, like multiple paper trays, probably won't work.)
Other options to check out:
OpenPrinting drivers (free)
https://www.openprinting.org/drivers#:~:text=List of available drivers Driver, 3 55 more rows
Printfab/XL ($54/$150)
http://www.printfab.net/
