logstash - logstash is a tool for managing events and logs.
MySQL - The world's most popular open source database
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
rsyslog - Rsyslog is an enhanced syslogd supporting, among others, MySQL, PostgreSQL, failover log...
SQLite - SQLite Home Page