php-syslog-ng is a front-end for viewing syslog-ng messages logged to MySQL. It lets you quickly and easily manage logs from many hosts. It features customized searches based on host, facility, priority, date/time, and the content of the log messages. It also has a tail mode, with customized filters, that enables you to monitor your systems in near real time.
NagMIN is a enterprise class Network Monitoring System, Powered by Nagios, WebMIN, RRDtool, Nmap, Fping, Net::SNMP, Syslog-NG and other open source software providing web-based administration, and enhanced web portal to help you manage your network.