- [Fluentd](http://www.fluentd.org/) - Log Collector and Shipper.
- [Fluentd](http://www.fluentd.org/) - Log Collector and Shipper. ([Source Code](https://github.com/fluent/fluentd)) `Apache-2.0``Ruby`
- [Flume](https://flume.apache.org/) - Distributed log collection and aggregation system.
- [GoAccess](http://goaccess.io/) - Real-time web log analyzer and interactive viewer that runs in a terminal or through the browser. ([Source Code](https://github.com/allinurl/goaccess)) `MIT``C`
- [Graylog](https://www.graylog.org/) - Pluggable Log and Event Analysis Server with Alerting options.