CUPS

CUPS was originally an acronym for Common Unix Printing System, but now is a free-standing expression. CUPS incorporates a variety of TCP/IP printing protocols including:

• Internet Printing Protocol (IPP)
  • Line Printer Daemon (LPD) protocol
• Server Message Block (SMB)

References:

http://www.cups.org/doc-1.1/sum.html#1_1

http://www.linuxjournal.com/article/8618