[free-software-melb] Sawmill software

http://www.sawmill.net/formats/unix_syslog.html "Sawmill is a Open Source Unix Syslog log analyzer (it also supports the 997 other log formats listed to the left). " Does that mean the sawmill software is open source? Apparently not. Does anyone have any recommendations for one, other than logstash? I'm after something a little more lightweight.