Internal Program Version: CUPS  2.4.19 (The man files)

CUPS is a modular printing system which allows a computer to act as a
print server. A computer running CUPS is a host that can accept print
jobs from client computers, process them, and send them to the
appropriate printer.

CUPS consists of a print spooler and scheduler, a filter system that
converts the print data to a format that the printer will understand,
and a backend system that sends this data to the print device. CUPS
uses the Internet Printing Protocol (IPP) as the basis for managing
print jobs and queues. It also provides the traditional command line
interfaces for the System V and Berkeley print systems, and provides
support for the Berkeley print system's Line Printer Daemon protocol
and limited support for the server message block (SMB) protocol.

CUPS comes with a built-in web-based interface.

https://openprinting.github.io/cups