CheckHost
Network management tool continuously monitors specific host availability. When network errors occur, Check hosts can alert the network administrator by e-mail or by sound alerts. If a host does go down, Check hosts automatically notifies the network administrator and writes a detailed log which...
http://miridixsoft.com/files/checkhost_setup.exe - 684Kb - Download - Screenshot

WinSuperKit
WinSuperKit is a powerful network toolkit that is used to list ip address and MAC address of all PCs on network neighborhood, find ip address of a special host or host name of a specail ip address on internet or intranet, ping a host, trace routes and display the geographical location of the ip... Monitor the speed of your network. ... Ping a host and find the geographical location. ... Trace a host and find the information about routes. ... Get the detail information of a host(whois), display geographical location.
http://www.qwerks.com/download/4808/wsk.zip - 13Mb - Download - Screenshot

AddrMon
AddrMon is a network tool that can be used to debug or monitor a network or see if host computers are online. Addrmon can PING (Packet INternet Groper), Traceroute or Monitor a single or multiple host computers simultaneously. PING a computer to determine whether a particular IP address (host)... Monitor a host by a continuous sending of ICMP packets at user defined intervals. ... The Monitor Grid give you a snapshot view of all of the hosts. ... TraceRoute the real-time path to a remote host by viewing the IP addresses or resolved names of all the routers in between.
http://www.bpsoftware.com/download/addrmon.zip - 535Kb - Download - Screenshot

Axence NetTools
Host monitoring with alerting and long term charts of response time & packet lost. With alerting you can set e-mail, message, sound, and tray notifications. Other features: graphical ping, fast traceroute (full trace in 1 second), lookup, port scanner, TCP/UDP service scanner, network scanner... It has the most highly intuitive user interface and may run in the Icon tray to continuously monitor hosts. ... Free and Pro versions. ... ), and full SNMP browser.
http://www.axencesoftware.com/Download/NetTools2.exe - 6Mb - Download - Screenshot

Monitor Wolf
Is your Web Site Working Right Now? Let your PC watch your web site every minute of the day! Accurately measures the performance of any web site. Tracks server response using Active Ping technology, verifies DNS resolution and monitors HTTP visibility. ... Monitor Wolf can contact you immediately when a problem occurs so you know what is happening in "real time". ... Monitor Wolf measures important response parameters from any website including "average response time", " min/max response time", "slow response percentage", "Up-Time percentage" and much more.
http://www.lonewolf-software.com/MonitorWolf/MWsetup.exe - 6Mb - Download - Screenshot

Advanced Host Monitor
HostMonitor is an award-winning system management tool that continuously monitors servers availability and performance. It can monitor any TCP service, ping a host, retrieve an URL, check the available disk space, check integrity of your files and web site, test your SQL server, and much more... Advanced Host Monitor package is available in several licensing options: Lite ($99), Standard ($175), Professional ($275), Enterprise ($399) and Enterprise With Lifetime Updates ($799). ... The program includes a Log Analyzer which can illustrate separate information for each tested host, collect...
http://www.hostmonitor.biz/download/host-mon.exe - 9Mb - Download - Screenshot

Cisco CDP Monitor
Cisco CDP Monitor is an efficient network diagnostic and troubleshooting tool. It is very useful for network administrator and network engineer. At first, Cisco CDP Monitor is a CDP agent for windows host. It is able to use the CDP(Cisco Discovery Protocol) which is a private protocol and is... With Cisco CDP Monitor, You can send the information (CPU number and model, host name, user name and the windows version, service pack version) of your host to the connective Cisco device with CDP, and you can get and display the information from the connective Cisco device, such as device name,...
http://www.tallsoft.com/cdpmonitor_setup.exe - 917Kb - Download - Screenshot

First Alert Service Monitor
Monitors Internet Services and alerts the user with a variety of methods if down. Always know whether or not your web site or other network services are up or down with First Alert Service Monitor. First Alert Service Monitor will check your site or other services as often as you have it... You can use the First Alert Service Monitor [Execute Program] option to fix the problem in many cases. ... If your site or service does go down and then come back up without you knowing about it, First Alert Service Monitor will send you emails documenting the events date and time from down to up again.
http://download1.electrasoft.com/fasmsx.exe - 574Kb - Download - Screenshot

32bit Service Monitor
Monitors Internet Services and alerts the user with a variety of methods if down. Always know whether or not your web site or other network services are up or down with 32bit Service Monitor. 32bit Service Monitor will check your site or other services as often as you have it configured to. ... You can use the 32bit Service Monitor [Execute Program] option to fix the problem in many cases. ... If your site or service does go down and then come back up without you knowing about it, 32bit Service Monitor will send you emails documenting the events date and time from down to up again.
http://download1.electrasoft.com/32bssx.exe - 574Kb - Download - Screenshot

MultiPing
See the network, pinpoint the problem. MultiPing is an application built for monitoring graphically one or more TCP/IP hosts, while providing detailed historical information about the collection period. Using the proven and powerful PingPlotter engine technology, MultiPing allows you to monitor...
http://www.multiping.com/downloads/mping_1.exe - 693Kb - Download - Screenshot