NetworkTrafficView is a network monitoring tool that captures the packets pass through your network adapter, and displays general statistics about your network traffic.

The packets statistics is grouped by the Ethernet Type, IP Protocol, Source/Destination Addresses, and Source/Destination ports. For every statistics line, the following information is displayed: Ethernet Type (IPv4, IPv6, ARP), IP Protocol (TCP, UDP, ICMP), Source Address, Destination Address, Source Port, Destination Port, Service Name (http, ftp, and so on), Packets Count, Total Packets Size, Total Data Size, Data Speed, Maximum Data Speed, Average Packet Size, First/Last Packet Time, Duration, and process ID/Name (For TCP connections).

LanTopolog is a freeware application that provides physical network topology discovery, visualization and monitoring. .

EzPing is designed as a GUI tool that enables you to ping IPs and hosts. It is the easiest GUI(graphical user interface) ping tool on the internet. It is free of charge, 100% Freeware.

EzPing operates by sending Internet Control Message Protocol (ICMP) echo request packets to the target host and waiting for an ICMP response. It works in the same way as ping tool in windows system and is the good replacement of it. You can set/unset the DF(Don't Fragment) flag, TTL(Time To Live), timeout , interval, and count to sent. You can get the fast IP of domain name when domain have multiple IP address, and can copy the IP to clipboard or directly launch the IP in browser.

Computer network administration can use it to test the availability of a host on an Internet Protocol (IP) network and to measure the round-trip time for messages sent from the originating host to a destination computer.

EzWhois is designed as a GUI client tool that enables you to perform whois lookups for domain names (and IP addresses). It is free of charge, 100% Freeware.

You can use EzWhois to find out domain information such as registrar, domain status, expiration date, and name servers. It can also help you find contact information for the owner of a domain name or IP.

Hamachi is 100% free for non-commercial use with up to 16 clients. Perfect for gamers and home networking.

It also offers SMTP/IMAP Roundtrip-Email Monitoring and VMware Monitoring, Toplists for Packet Sniffing and Netflow Sensors, as well as sensor aggregation using its built-in Sensor Factory.

PRTG Network Monitor includes more than 40 sensor types for all common network services (e.g. PING, HTTP, SMTP, POP3, FTP, etc.), allowing users to monitor networks for availability, speed and failures. As soon as an outage occurs, alerts are sent via email, SMS, pager messages and other means. Request times and downtimes are recorded in an internal database, making it easy to compile performance, downtime and SLA reports. Monitoring, reporting and notifications can be automatically scheduled at specific times. Network maps can be created which provide users with a unique visual network management tool.

PRTG Network Monitor´s Freeware Edition is completely free for personal and commercial use. The Commercial Editions are required if you want to monitor more than ten sensors.

This utility allows you to easily turn on one or more computers remotely by sending Wake-on-LAN (WOL) packet to the remote computers.
When your computers are turned on, WakeMeOnLan allows you to scan your network, and collect the MAC addresses of all your computers, and save the computers list into a file. Later, when your computers are turned off or in standby mode, you can use the stored computers list to easily choose the computer you want to turn on, and then turn on all these computers with a single click.

WakeMeOnLan also allows you to turn on a computer from command-line, by specifying the computer name, IP address, or the MAC address of the remote network card.