glogg - glogg is a multi-platform GUI application to browse and search through long or complex log files.
logstash - logstash is a tool for managing events and logs.
BareTail - BareTail is a real-time log file monitoring tool. Features Real-time file viewing
rsyslog - Rsyslog is an enhanced syslogd supporting, among others, MySQL, PostgreSQL, failover log...
klogg - klogg is the fork of glogg - the fast, smart log explorer.
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.