StatsD
Simple daemon for easy stats aggregation.
16 Alternatives To StatsD
Ganglia
Scalable distributed monitoring system
Graphite
Graphite is a highly scalable real-time graphing system.
Hosted Graphite
Graphite as a service
HostedMetrics
Managed and hosted versions of various metrics platforms and time-series databases, as a service. InfluxDB, Graphite, and more. Sensibly pre-configured and includes Grafana and alerting.
Icinga
Icinga is a fork of Nagios and is backward compatible.
Kaseya Traverse
Kaseya Traverse offers IT monitoring solutions and real-time visibility through unified monitoring of cloud and network Infrastructure.
Kibana
Easily visualize data pushed into Elasticsearch from Logstash, es-hadoop or 3rd party technologies…
Librato
Your monitoring infrastructure in the cloud. Store, visualize and alert on all your metrics at all levels of the stack. Get your 30d free trial.
PagerDuty
Cloud based monitoring service
Prometheus
An open-source systems monitoring and alerting toolkit.
Riverbed SteelCentral
Platform for location-independent computing to ensure application performance and the best user experience.
Sensu
Monitor servers, services, application health, and business KPIs. Get notified about failures before your users do. Collect and analyze custom metrics. Give your business the competitive advantage it deserves.
Site24x7
Site24x7 offers both free & paid website monitoring services. Monitor websites remotely and receive instant email/sms alerts if your website becomes unavailable. View uptime & performance graphs of your website monitors.
Telegraf
Telegraf is the Agent for Collecting & Reporting Metrics & Data.
collectd
System and applications metrics collector