Log systems

Log systems

Seems the most popular is ELK(elasticsearch+logstash+kibana) which also need redis or Kafka.

Splunk

Commercial. Most powerful.

graylog

https://github.com/Graylog2/graylog2-server
Java,ElasticSearch+MongoDB+Graylog-server+WEB UI
Support user authentication and Alert,which is commercial support in ELK stack.

elasticsearch

Java

logstash

Ruby

kibana

https://github.com/elastic/kibana

kafka

Java
Message system with log aggregation solution

fluentd

http://www.fluentd.org/
Ruby

flume

https://github.com/apache/flume

sumologic

Commercial

Loggly

Commercial