- Monit
- Ganglia
- Munin
- Cacti
- Nagios
- Zabbix
- Observium
- Zenoss
- Collectd
- Argus
- BandwidthD
- Pandora FMS
- Zenoss Core
- Splunk
- Xymon
- Icinga
- ntop
- Scout Realtime
- StatsD - Etsy
- https://papertrailapp.com/plans
- https://www.loggly.com/plans-and-pricing/
- http://graylog2.org/
- http://logstash.net/
- http://loganalyzer.adiscon.com/
- http://www.elasticsearch.org/overview/kibana/
- http://logio.org/