1. Nagios: Nagios is an open-source server monitoring tool that offers comprehensive monitoring of your entire IT infrastructure – servers, network devices and applications. Its flexibility and scalability make it a popular choice among businesses of all sizes.

2. Zabbix: Zabbix is a powerful, open-source monitoring solution that provides real-time monitoring of servers, networks, and applications. With its customizable dashboard and alert system, Zabbix helps you stay on top of your infrastructure’s performance.

3. SolarWinds Server & Application Monitor (SAM): SolarWinds SAM is a robust server monitoring tool that provides in-depth insights into the health and performance of your servers and applications. With its easy-to-use web interface, SAM simplifies troubleshooting and helps you find the root cause of issues faster.

4. Datadog: Datadog is a cloud-based server monitoring service that allows you to track the performance of your entire infrastructure – servers, containers, applications, and more. Its advanced analytics capabilities enable you to easily identify bottlenecks and other potential issues.

5. New Relic Infrastructure: New Relic Infrastructure is a real-time server monitoring tool that automatically collects data from your servers and other infrastructure components. Its powerful analytics engine helps you detect trends, anomalies, and patterns in your system’s performance.

6. PRTG Network Monitor: PRTG Network Monitor by Paessler is an all-in-one network, server, and application monitoring solution that offers easy installation and intuitive user interface. It includes more than 200 predefined sensors for out-of-the-box monitoring.

7. Icinga: Icinga is an open-source server monitoring tool that lets you keep an eye on the availability and performance of your network resources, services, and applications. Its modular architecture allows for easy implementation of custom plugins and integrations.

8. ManageEngine OpManager: ManageEngine OpManager is a comprehensive network and server monitoring software that provides real-time performance metrics, deep packet analysis, and advanced fault management capabilities in a single platform.

9. Checkmk: Checkmk is an open-source server monitoring tool that offers complete visibility into your servers, network devices, and applications. Its intuitive web interface makes it easy to monitor your infrastructure’s health and performance in real-time.

10. Opsview: Opsview is a scalable server monitoring solution that simplifies the management of complex IT environments. With its customizable dashboards and alerting capabilities, Opsview ensures that you have complete visibility into your infrastructure’s performance.

In conclusion, these ten server monitoring tools each offer unique features and functionalities to help you manage your IT infrastructure more efficiently. By identifying potential problems early on and providing insights into the root cause of issues, these tools can significantly improve the overall performance of your server environment.