Kiwi Syslog Server - Kiwi Syslog Server prvides solution to centralize and simplify log message management across network devices and servers.
nxlog - NXLog offers log management solutions for companies of all sizes.
Mac Syslog Center - Lan-Secure Syslog server monitor for Mac-OSX provides real-time syslog server including filtering, correlation, actions and events capabilities.
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.
rsyslog - Rsyslog is an enhanced syslogd supporting, among others, MySQL, PostgreSQL, failover log...
Syslog Watcher - Syslog Watcher is a syslog solution for Windows.