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... Free and Pro versions. ... It has the most highly intuitive user interface and may run in the Icon tray to continuously monitor hosts. ... ), and full SNMP browser.
http://www.axencesoftware.com/Download/NetTools2.exe - 6Mb - Download - Screenshot

Netjini Plus Traffic Analyzer
See the standard RMON statistics for your whole network segment. ? Traffic matrix and chart (shows traffic between stations/hosts) ? Host table and chart (shows traffic by host) ? TCP/UDP port table and chart (shows activity by port) Distribution ? MAC layer octet distribution ? ... TCP/UDP octet distribution ? ... NetBIOS octet rate ? ... SNMP octet rate ? ... Captures packets from local and remote segments PROTOCOLS See which protocols are in use on you network. ... APPLICATIONS See which applications are in use on your network.
http://www.cbr.com.tr/cbr/netjiniplus/eng/netjiniplus_eng.exe - 16Mb - Download - Screenshot

1Click Clocksync
1Click Clocksync is a small utility that does a great work by keeping the computer clock accurate. It uses the US government atomic clock time servers as a reference time source. The application supports the Simple Network Time Protocol (SNTP) and the TIME protocol. ... It can work over TCP or UDP transport protocols. ... You can configure 1Click Clocksync to adjust your computer clock automatically at predefined time intervals. ... The program has an easy-to-use interface that even the most inexperienced users will have no difficulties using this program.
http://www.express-computing.com/files/ClocksyncSetup.exe - 570Kb - Download - Screenshot

PingPlotter Pro
PingPlotter Pro is a network monitoring and troubleshooting tool. It runs in the background collecting data for one or many remote hosts, and then allows network professionals/admins fast and easy access to network routing and performance information. ... Remote tracing, a native web interface, a highly configurable alert system with a built-in script engine and TCP/UDP/ICMP tracing are just some of Pro's advanced features. ... Additional VoIP targeted capabilities such as Jitter, MOS, packet loss and latency make PingPlotter Pro a must have tool in any admins toolbox.
http://www.pingplotter.com/downloads/pngplt_pro.exe - 2Mb - Download - Screenshot

WinSyslog
WinSyslog is an enhanced syslog server for Windows. It works much like a Unix syslog daemon but offers enhanced features. Among others, it writes syslog messages to a flat file, database or sends them as email-alerts. WinSyslog receives messages via UDP, TCP as well as RFC 3195. ... Runs as a background service or Windows GUI application. ... Basic features are free to use, enhanced features require a registration. ... The enhanced features can be tried for free for 30 days. ... WinSyslog's rule engine allows extremely flexible customizing.
http://download.adiscon.com/wnsyslog.exe - 9Mb - Download - Screenshot

HS TFTP C Source Library
HS TFTP is a software library in C (supplied with full source code) which implements Trivial File Transfer Protocol (TFTP) over UDP socket layer according to RFC 1350. Support for client and server side for both file get and put are provided. Optional 1024 block size vs 512 size configuration is... HS TFTP internally at a lower layer interfaces to HS Sock library which provides UDP transport services. ... com/hs tftp_buy. ... - HS TFTP library user manual, which documents in detail complete library API.
http://www.hillstone-software.com/hs_tftp_demo.exe - 340Kb - Download - Screenshot

NetStat Agent
A powerful TCP/IP troubleshooting tool for diagnosing and monitoring network. It displays all active TCP and UDP connections on your computer, ports on which the computer is listening, the state of that connections and the owning process. Under WinXP, you can get more information about process... Netstat Agent is a set of command line utilities like Netstat, Ping, Ipconfig, Route, ARP, Tracert, but in a graphical interface. ... It is a first network assistant for anyone. ... Using a powerful monitor, you can close unwanted connection or terminate enemy process automaticlly.
http://www.flexbyte.com/download/nsagent.zip - 862Kb - Download - Screenshot

Network Troubleshooting Analyzer
Packet Analyzer pro edition is an advanced packet analysis and sniffing tool with powerful protocol decodes capabilities. It can capture all traffic transport over local network segment and decodes all major and frequently used protocols including TCP/IP, UDP, HTTP, HTTPS, SMTP, POP3, TELNET,... Packet Analyzer Key Features: Smart Real-time packet capturing and analyzing; Reconstructs TCP/IP sessions and enables you to see data in their original format; Capture, display and save transaction information such as user name and password and the entire message Capture Pop3 and SMTP emails,...
http://www.javvin.com/packetpro_demo.zip - 7Mb - Download - Screenshot

easy Look at Net
easy Look at Net is a simple ports scanner, packet sniffer and web-page source loader. Multithread port scanner and packet sniffer specifically made to scan opened TCP ports, packets are filtered by incoming and outgoing, by IP addresses, ports and protocols - TCP, UDP, ICMP, IGMP. ... Besides there is no need in third-party libraries, such as WinPCap, etc. ... Utility does not demand installation and is very simple in management that is important for beginning managers of networks. ... Simple web-page source downloader worked via proxy server, if is present in system.
http://lookanet.com/download/lookanet.exe - 164Kb - Download - Screenshot

Essential NetTools
Essential NetTools is a set of network tools for diagnosing networks and monitoring your computer's network connections. NetStat: displays the list of your computer's network connections, information on open TCP and UDP ports, IP address, and connection states. ... RawSocket: provides you with the ability to establish low-level TCP and UDP connections to troubleshoot and test different networking services. ... NSLookup: allows you to convert IP addresses to hostnames and perform advanced DNS queries.
http://www.tamos.com/files/ent4.zip - 3b - Download - Screenshot