The very good free Xine multiplayer is available for installation from blastwave with IPS.
To Install Xine you only need to set the URL prefix for blastwave packaging repository
and install it with pkg install.
Add blastwave and Sunfreeware packaging repository:
# pkg set-authority -O http://blastwave.network.com:10000 blastwave
# pkg set-authority -O http://pkg.sunfreeware.com:9000 sunfreeware
# pkg authority -H
blastwave http://blastwave.network.com:10000/
sunfreeware http://pkg.sunfreeware.com:9000/
opensolaris.org (preferred) http://pkg.opensolaris.org:80/
Search for xine
# pkg search -r xine
INDEX ACTION VALUE PACKAGE
basename dir opt/csw/share/xine pkg:/IPSlibxine-AT-0.5.11-2-DOT-6
basename file opt/csw/bin/xine pkg:/IPSxineui-AT-0.5.11-2-DOT-6
And Install Xine
# pkg install IPSlibxine
# pkg install IPSxineui
Then to run Xine:
# /opt/csw/bin/xine