logstash - open source log management
http://logstash.net/docs/1.0.17/getting-started-centralized
Homepage of Zabbix :: An Enterprise-Class Open Source Distributed Monitoring Solution
http://wwww.zabbix.com/
Installing logstash on CentOS 5.7 - Bits & Bytes of Life
http://mylessteinhauser.com/blog/2011/10/25/install-logstash-centos/