Splunk is a software platform to search, analyze and visualize the machine-generated data gathered from the websites, applications, sensors, devices etc. which make up your IT infrastructure and business

The ELK Stack is a robust solution for search, analysis, and visualization of data. Logstash collects and parses logs, Elasticsearch indexes and stores the information, and Kibana presents the data in visualizations that provide actionable insights.

Graylog is a leading centralized log management solution built to open standards for capturing, storing, and enabling real-time analysis of terabytes of machine data.

A robust toolkit for monitoring and alerting, Prometheus offers multi-dimensional data model, flexible query language, efficient storage, and integration with many popular support services.

Nagios is a widely used open-source tool for comprehensive monitoring. It can monitor applications, services, operating systems, network protocols, system metrics, and network infrastructure.

Zabbix is an open-source monitoring software tool for networks, servers, virtual machines, and cloud services. It offers real-time monitoring of thousands of metrics collected from different servers.

DataDog is a monitoring service that brings together data from servers, databases, applications, tools, and services to present a unified view of the applications that run at scale in the cloud.

Sentry is an open-source error tracking tool that helps developers monitor and fix crashes in real-time. It intercepts and logs exceptions and errors, providing an easy-to-use interface for viewing and tackling persistent issues.

New Relic's application monitoring gives you detailed performance metrics for every aspect of your environment. You can track user experiences, databases, and individual components.

AppDynamics, a part of Cisco, is a full-stack, business-centric observability platform that helps technologists prevent digital performance issues.

PagerDuty is an incident management platform that provides reliable incident notifications via email, push, SMS, and phone, as well as automatic escalations, on-call scheduling, and other functionality to help teams detect and fix infrastructure problems quickly

Amazon CloudWatch is a monitoring service for AWS resources and the applications you run on Amazon Web Services. You can use it to collect and track metrics, collect and monitor log files, and respond to system-wide performance changes.