CUPS is Apple’s open-source printing system for Unix-like operating systems, using IPP Everywhere to drive local and network printers. It provides the spooler, drivers interface, and admin tools behind printing on many macOS and Linux deployments.
Facts apply to the named version and check date. Send a sourced correction if something changed.
CUPS pricing questions
Is CUPS free?
Yes. CUPS has an ongoing free plan. Open-source releases are downloadable from cups.org under Apache 2.0 (2.3+) or earlier GPL/LGPL terms noted on the site.
How much does CUPS cost?
CUPS is listed as free. No paid plan with a published price was found.