Paul Smedley has ported CUPS
version 1.4.5 (dated 11/21/2010, but posted on 2/2/2011), as well as
Gutenprint 5.2.6 (11/21/2010), HP-LIP version 3.10.2 (5/3/2010), Splix
version 1.1.1 (12/26/2008), Foomatic version 4.05 (9/26/2010), and
foo2qpdl (6/28/2010). Also available (4/10/2009) is a CUPS port driver,
which allows interfacing the standard OS/2 printing subsystem with
CUPS. CUPS is the Common Unix Printing System; the goal is to improve
the printing support in eComStation. You can see what printers are
potentially supported; those mentioned as working with CUPS or Gutenprint should work. There is a newsgroup dedicated to discussion and feedback, as well as a HowTo.
Source: OS/2 Warp News and Rumors