Cacti
Cacti is a complete network graphing solution. It provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features.
18 Alternatives To Cacti
Check_MK
Check_MK is comprehensive IT monitoring solution in the tradition of Nagios.
Icinga
Icinga is a fork of Nagios and is backward compatible.
LogicMonitor
LogicMonitor is the SaaS performance monitoring platform for the world’s best IT teams. Deploy Fast, Monitor More, Improve Ops.
MachMetrics
Website Speed Monitoring, for performance nerds.
Munin
PnP networked resource monitoring tool that can help to answer the what just happened to kill our performance
Observium
Observium
OpsGenie
Alerting and On-Call Management for Dev&Ops Teams
PRTG Network Monitor
An advanced network monitoring solution to monitor network up/downtime, traffic and usage.
PagerDuty
Cloud based monitoring service
Pulseway
Pulseway changes the enterprise monitoring and management game with its mobile management solution.
RapidSpike
RapidSpike is an uptime and performance monitoring service for websites and web applications.
Raygun
Raygun gives developers meaningful insights into problems affecting their applications. Discover issues - Understand the problem - Fix things faster.
Rollbar
Rollbar collects errors that happen in your application, notifies you, and analyzes them so you can debug and fix them. Ruby, Python, PHP, Node.js, JavaScript, and Flash libraries available.
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.
Sumo Logic
Sumo Logic is a secure, purpose-built cloud-based machine data analytics service that leverages big data for real-time IT insights
VictorOps
We make on-call suck less & help teams to solve problems faster.
Wireshark
Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.