Roadkil's Detector 1.2
Detects unauthorised attempts to access your computer over the network. Program listens on ports selected by you and lists any attempts to connect to them. Allows you to track down where connections are coming from and do something about them.
License:Freeware, $0 to buy Size:43 KBLatest Update:2004-12-09
LAN Tornado 1.4
LAN Tornado is the very useful, easy-to-use and low cost network testing software. LAN Tornado is a network traffic generator for Ethernet based networks.
License:Shareware, $19.95 to buy Size:517 KBLatest Update:2009-01-26

NetDog Anti-Porn V3.9
NetDog Anti Porn, Block Porn web sites now! NetDog Anti Porn is an Anti-porn software. NetDog Anti Porn allows you to easily filter out pornographic web site on the Internet. NetDog Anti Porn can work with all kinds of web browsers. Anti Porn Now !
License:Shareware, $24.99 to buy Size:538 KBLatest Update:2006-07-26

Crysnet Bandwidth Manager 1.0
By monitoring your network traffic and limiting the bandwidth, the software increases the network efficiency immediately with a reduction in your overall bandwidth requirement while allowing business-critical network applications to run smoothly.
License:Shareware, $29.95 to buy Size:1.49 MBLatest Update:2006-07-18

Axence NetTools 5.0.1.13755
FREE set of professional network tools: NetWatch - network monitoring, alerting; WinTools lists exhaustive system info from Windows computers; port/network scanner; NetStat lists local connections; TCP/IP workshop; ping; trace; lookup; SNMP browser.
License:Freeware, $0 to buy Size:36.09 MBLatest Update:2013-08-01

Server Website Monitoring Tool 3.1.0.8
Network server monitoring software sense website downtime uptime internet IP ping connection speed observe upload download bandwidth traffic performance detects outage mishap host alert by alarm indicator track slow response time RTO request time out
License:Freeware, $0 to buy Size:919 KBLatest Update:2006-12-09

DomainScan (Formerly NetScanG) 6.61
DomainScan Standard is a great network monitoring application for smaller businesses and public institutions. DomainScan is capable of monitoring network devices and detect online users. It’s easy to use, and will display a lot useful informat
License:Freeware, $0 to buy Size:4.09 MBLatest Update:2009-03-18

DomainScan Server Monitoring 7.12
DomainScan Server Monitoring is the perfect network monitoring solution for System administrators and DomainScan Server Monitoring can monitor all network devices, collect audit information, search devices and detect users.
License:Freeware, $0 to buy Size:5.63 MBLatest Update:2013-08-12

NetworkActiv PIAFCTM 2.2.2
Packet analyzer with HTTP file capture, a Graphical Packets Mode that shows traffic with visual effects, per-IP/per-Port/per-IP-Pair statistical information collection, and more. All in a single, easy to use Windows application. Freeware.
License:Freeware, $0 to buy Size:1.16 MBLatest Update:2008-02-13

Simple Server Monitor 2.0.5
Simple Server Monitor is a powerful, yet easy to use server monitor. It allows you to monitor the status of your servers and web applications from your desk. Supports pop-up, e-mail, sound, launch external application, log file, and event log alerts.
License:Shareware, $69.95 to buy Size:6.29 MBLatest Update:2008-01-01

easy Look at Net 0.8.9
"easy Look at Net" is a simple ports scanner, packets sniffer and web-page source loader. Multithread ports scanner and packets sniffer specifically made to scan opened TCP ports, packets are filtered by incoming and outgoing, by IP addresses.
License:Freeware, $0 to buy Size:136 KBLatest Update:2007-01-05

NetShareWatcher 1.5.8
NetShareWatcher is network security improvement software. It allows network administrators to monitor network shares and identify shares which are violating data access policy of their organization.
License:Shareware, $28.5 to buy Size:3.57 MBLatest Update:2013-01-25

The Dude 2.1
It will automatically scan all devices within specified subnets, draw and layout a map of your networks, monitor services of your devices and alert you in case some service has problems.
License:Freeware, $0 to buy Size:1.79 MBLatest Update:2006-06-05