syslog-ng
syslog-ng is an open source implementation of the Syslog protocol for Unix and Unix-like systems. It extends the original syslogd model with content-based filtering, rich filtering capabilities, flexible configuration options and adds important features to syslog, like using TCP for transport. As of today syslog-ng is developed by Balabit IT Security Ltd. It has two editions with a common codebase. The first is called syslog-ng OSE (with the license LGPL) and have additional plugins (modules) under proprietary license. This edition is called Premium Edition (PE).
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