Syslog2
Syslog2 is a realtime parser and event handler for syslogd. An event is a message from some service. It uses a simple plugin system to add event handlers. Syslog2 is written in Perl. A plugin is simply a Perl script which invokes the "register_handler" or "unregister_handler" subroutines. By default, the package uses the included script "default.pl", which logs all messages from the syslog daemon in sorted order. More scripts are available from the homepage.