AdRem NetCrunch delivers out-of-the-box network monitoring designed especially for small and medium sized companies.
With NetCrunch, you always know exactly what's happening with your critical applications, servers, and network devices.

AdRem NetCrunch is a utility package that monitors computer networks. It displays your network topology, various information gathered through SNMP (Simple Network Management Protocol), complex reports about your network, and more. It monitors the status of each node in your network. If a problem is detected, the software can send custom messages to the network administrator.

Basically everything connected to the network we can consider as a service. If there is some device on the network it always suits its purpose which is exactly providing a service. There are only different methods of checking those services availability.

Basic Level
Some of the services (devices) can be checked by a simple PING where some others can be checked more thoroughly by Network Services monitors. We call these monitors intelligent pings because they can check not only connectivity but also response received.
NetCrunch monitors availability of over 65 predefined TCP/UDP network services, including DNS, FTP, HTTP, POP3, SMTP, etc. It can monitor network services performance measured upon number of packets sent and received, response time, and percentage of packets received and lost.
The monitored services can be customized and administrators can add their own definitions.
Advanced Level - User Experience Monitors
Monitoring of some important services can be performed on multiple levels. As the low level checks only basic service answer (it's usually some kind of HELLO), the higher levels of monitoring allow to check more specific things like authentication (HTTP, FTP, POP3, SMTP) or if the service is operating properly (i.e. downloading file, receiving and sending test email).

NetCrunch Features:
* Auto Discovery
* Perform initial and scheduled discovery and classification of network resources.
* Network Views
* Present physical and logical network topology as graphical maps and dynamic network views.
* Event Management
* Collect events from Windows, Syslog and SNMP traps. Get alerted when problem occurs.
* Monitoring Policies
* Use predefined or customized monitoring rules and data collection settings.
* Availability Monitoring
* Monitor availability of network devices and services. (HTTP, POP3, SMTP, etc.).
* Performance Monitoring
* View real-time statistics, multi-server charts, and performance trends.
* Long-term Trend Analysis
* Define and generate reports on demand or have them delivered periodically via email.
* Remote Access
* Receive alerts on remote notification client, view network status via web browser.

Detect and map logical and physical network topology and monitors performance, availability and response time of network hosts, services and applications with AdRem NetCrunch. The software provides multiple notification options (e-mail, pager, ICQ, SMS, SNMP), automatic corrective actions, alert escalation and delay, event log, trending, reporting and web access. Custom network views can illustrate business processes. Diagnostic tools include traceroute, bandwidth and port scanner. Supports Windows, NetWare and SNMP.

AdRem NetCrunch has a proven track record in helping businesses receive value from dollars invested in their IT infrastructures. The design features of NetCrunch enable IT staff to eliminate the most troubling performance and technology inefficiencies associated with the reactive and segmented network management models
The software provides intuitive, policy-based design, superior network-wide visibility, granular and extensive monitoring, data and domain consolidation, automation, and out-of-the-box intelligence. Leveraging these abilities, the software users can quickly become more productive, staying ahead of disruptions, detecting and resolving problems faster, and allocating resources more impactfully. On a higher organizational level, this allows IT shops to transition to a preventative, proactive, and unified operations model. As a result, businesses can realize the following benefits:
* Reduced IT Operations Costs and Increased Revenue
* Improved IT-Business Alignment
* Immediate Return on Investment (ROI)

The license of this software is Free Trial Software, the price is $2595, you can free download and get a free trial.