EDraw Network Diagrammer is a professional network diagramming software with rich examples and templates. Easy to draw detailed physical, logical, Cisio and network architecture diagrams, using a comprehensive set of network and computer equipment shapes.

Aspose.Network is a suit of flexible and .NET network programming components which aims for providing a more comprehensive and complete solution for professional network application development on .NET platform.

Network Ping is the network diagnostic utility that allows
visual monitoring of computers/devices activity in the network.
The notification feature helps to identify the machines
ping reply status change by sending emails.

PingTester is a visual network test tools, it can stores a list of IP addresses / URL and network test commands to increase the working efficiency, perform ping test by 1 click, 'ping sweep' subnets or interval ping all the hosts on a list continuously, save the individual ping records to a txt or CSV file, generate statistics reports. And all other dos commands can run in the Windows form. The ping test job can auto run at scheduled time.

Network Probe is a network monitor and protocol analyzer that gives you an instant picture of the traffic situation on your network and enables you to identify and isolate traffic problems. Traffic statistics are graphically displayed in real-time. The network probe runs in Windows NT/2000/XP and Linux/FreeBSD/Solaris/MacOS X.

Network Sniffer is a Windows based Packet sniffer an Network analyzer
Network Sniffer is a Windows based Packet sniffer an Network analyzer, a revolutionary new network management tool designed from the ground up with ease and functionality in mind.

Network Sniffer aids at monitoring network traffic in order to recognize and decode certain packets of interest.

NADetector monitors and analyzes the network traffic and displays statistical information pertaining to each IP address pair and protocol, helping network administrators and users troubleshoot network problems. The main purpose of NADetector is to allow you to collect statistical information about your network traffic that passes through network adapters and display incoming, outgoing and summary traffic statistics.

Free SNMP provides basic support for SNMP protocol, allowing users to perform such tasks as viewing MIBs, performing Walk operation.The tool is designed with a user-friendly interface and is easy to use.

Alchemy Eye PRO is a system management tool that continuously monitors server availability and performance. In the event of network errors, Alchemy Eye PRO can alert the network administrator by cell phone or pager BEFORE problems get seriously out of hand. This helps protect your company's data and reduces the likelihood of costly network failures. If a server goes down, Alchemy Eye automatically notifies the network administrator.

Alchemy Eye is a system management tool that continuously monitors server availability and performance. In the event of network errors, Alchemy Eye can alert the network administrator by cell phone or pager BEFORE problems get seriously out of hand. This helps protect your company's data and reduces the likelihood of costly network failures. If a server goes down, Alchemy Eye automatically notifies the network administrator.

Jimsim is a Network Simulator that simulates up to three virtual routers on your system. Since the routers are all virtual, they communicate over virtual networks within the program. So, there is no worry about causing problems on your real network. You use a telnet program to connect to the virtual routers, who all have a Cisco-like command line interface.

CertExams.com CCNA Network Simulator with Designer has the following features:
-Several lab exercises: The labs are particularly useful for candidates preparing for Cisco CCNA Intro, ICND, and CCNA certifications. 40+ labs are available for thorough hands-on preparation.
-Cisco router console simulation: Cisco router console (running Cisco router IOS).
-Network designer using routers, switches, and PC
-Simulator
-Comprehensive help file

CertExams.com JNet Simulator has the following features:
-Several lab exercises: The labs are particularly useful for candidates preparing for JNCIA, Several labs are available for hands-on preparation.
-Simulator
-Comprehensive help file

AdventNet Simulation Toolkit comprises agent simulator and network simulator for testing, training and demonstration of network management applications. The network simulator enables simulation of SNMP (v1, v2c, v3), TL1, TFTP, FTP Telnet and IOS devices, on a single PC. It enables recording of real networks and traps, allows advanced modeling of agent/network behavior, PDU scrambler,management through RMI and dynamic virtual IP configuration.