Are there any alternatives to the system V spooler?

Sun has a new printing product available, "SunSoft Print Client".
It is the standard 2.6 print system and co-shipped with 2.5.

It has many new features, including printcap-like printer
configurations that can be shared via NIS, and currently
the ability to be configured so that lpsched does not have to
be run anymore on client-only systems (although you still need to
run lpsched in order for admintool to work.)

Alternatively, you can get a Solaris port of the BSD lpr system
from the following FTP site (get lpr-sol2-*.tar.gz):

or LPRng

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