This is an extensive, yet incomplete, list of tools that facilitate monitoring of web servers. The descriptions are mostly taken from their website's marketing overview text.

AppInternals Xpert delves into the complex software frameworks and operating systems of modern servers to extract vast amounts of performance and forensic data to support all aspects of APM from the server perspective. AppInternals Xpert can provide analysis for any type of application, but excels, in particular, in Java and .NET environments. It continuously monitors thousands of system and application metrics within each server, across all application tiers, and automatically detects and ranks performance and behavior anomalies.

Application Vantage helps identify and resolve application performance problems in production. By providing detailed troubleshooting analysis, Application Vantage helps pinpoint the causes of poor end-user response times for mission-critical applications to the client, the network, a server or the application itself.

AppManager Performance Profiler is self-learning, continuously configuring and continuously adapting as it profiles your environment's changing characteristics. When it detects abnormal system behavior, it sends Trusted Alarms® that help your staff quickly correct problems. AppManager Performance Profiler also provides workload modeling, adding value by enabling maximum utilization of system resources, as well as effective capacity management and virtualization planning.

AppMon makes it easy to run applications and monitor them from your current network monitoring package....even restart your applications automatically if they fail. AppMon is installed locally on a server that has applications that need to be monitored.

ASG-TMON BSM’s Performance ManagementTrack resource usage and process activity at the business service level and all of the physical components that make up the service, including server, database, application, network, operating system, application server or online transaction processing level (IMS/CICS/WebSphere), storage, even some third-party applications such as SAP R/3. In many cases, ASG-TMON BSM solutions offer the lowest overhead of any products in the category.

Axence nVision monitors servers, applications, routers and user activity. It collects hardware and software inventory; provides alerting and reports. The network is automatically discovered and presented on interactive graphical map. nVision automatically collects node hardware and software information: model, CPU, memory, main board, drives, cards, etc., installed applications and Windows updates.

BMC Performance Manager monitors the performance and availability of servers, applications and storage and network devices. Monitoring is accomplished remotely (agentless) with no software residing on the elements being monitored. BMC Performance Manager also integrates with BMC Performance Manager also monitors the performance and availability of Web transactions.

eCAP Monitor is a performance data collector that gathers system, network and application metrics - CPU, Memory, Disk, Process, IP, TCP, etc. It is designed to ensure minimum overhead. It provides data to be used by PAWZ, eCAP Analyzer and eCAP Planner. It is supported on the following platforms: IBM-AIX, HP-UX, HP Itanium, SUN Solaris, Sun x86 (Intel, AMD), HP Tru64 Unix, Linux (v2.4-2.6 Kernels - Intel), VMWare ESX, Windows 2000/2003, OpenVMS Alpha, VMS Itanium.

GFI Network Server Monitor automatically monitors the network & servers for failures. It allows you to identify issues and fix unexpected conditions before your users (or managers) report them to you! Alerts can be sent by email, pager or SMS. Actions, such as rebooting a machine, restarting a service or running a script can be done automatically.

Heroix Longitude® is an agentless application performance and network monitoring software that runs on multiple platforms. It monitors and alerts on the availability and performance of systems, applications, networks, and SLAs (Service Level Agreements) without requiring any software installation on the monitored computers.

ManageEngine Applications Manager is an availability and performance monitoring software that helps businesses ensure high availability and performance for their business applications by ensuring servers and applications have high uptime. The application performance management capability includes server monitoring, application server monitoring, database monitoring, web services monitoring, virtualization monitoring, cloud monitoring and an array of other application management capability that will help IT administrators manage their resources.

Meta-View Performance Manager provides data instantaneously over the Internet in both graphical and tabular form. This all-in-one performance management software package addresses Windows monitoring, Windows management, UNIX server and web server administration concerns.

MonitorIT is designed as an intranet/internet based, comprehensive Windows, Linux/Unix, Network Infrastructure Device monitoring, alerting, diagnosing, collecting and reporting tool for managing availability and performance of servers, workstations, and network devices in IP based networks.

PERFMAN provides the visibility into how your IT infrastructure, systems and applications are performing today – analyzing it to tell you visually how they will be performing in the future so you can allocate resources accordingly. PERMAN doesn’t use agents.

Performance Sentry, formerly known as NTSMF was engineered from the ground up to monitor Windows Server performance and pinpoint application bottlenecks.

Resolver Resource Monitor is a powerful system and application monitoring tool, Resolver enables system administrators, performance analysts, and capacity planners to quickly identify and resolve system performance issues impacting the productivity of their organization. Resolver brings performance measurement to a new level of refinement and is in production use at many Fortune 500 companies today.

Prognosis is an integrated suite of precise performance monitoring and management solutions for business-critical computer systems and applications such as distributed IT infrastructure, Payments systems, Communications, and Web applications.

Sysload SP Analyst is an intuitive productivity and diagnostic tool that offers real-time server and application performance monitoring, on-demand and historical troubleshooting and analysis, and manages server resource capacity.

SolarWinds Application Performance Monitor delivers powerful monitoring, alerting, and reporting capabilities to applications and servers—and at a price that won’t draw unnecessary attention from your CFO. In less than an hour, APM can discover your applications and provide the visibility you need into the performance of your applications and the underlying operating systems and servers they run on.