TrafficEmulator
Nsasoft Network Traffic Emulator generates IP/ICMP/TCP/UDP traffic from clients to server to stress test servers, routers and firewalls under heavy network load. It is a very simple and fast program which can simulate client activity. The tool is designed with a user-friendly interface and is...
http://www.nsauditor.com/freeware/downloads/TrafficEmulator.exe - 427Kb - Download - Screenshot

Wireless Snif
LAN and WLAN Sniffer. A program for low-level network packets capturing and analyzing in real-time. Allows to capture all network traffic even in switched LAN. Sniffer supports parsing of following protocols: IP, TCP, UDP and many others, includes support for RAS-connections (PPP). ... Also includes: tcpdump, tcpflow, tcpstat.
http://www.ufasoft.com/files/ufasoft_sniffer_4.1.113.exe - 1Mb - Download - Screenshot

TrafMeter
TrafMeter is a Windows-based tool providing realtime traffic accounting and monitoring. You can use it to count useful traffic of your computer (it's free! ) or use to build the traffic accounting system for all PCs in your office LAN. It makes easy to count custom IP packets and troubleshooting... all hosts in/not in your LAN, specific IP protocols (ICMP,TCP,UDP,OSPF,etc). ... In addition, TrafMeter allows TCP/UDP port filtering. ... Each filter is represented by a unique color, which allows the webmaster and/or administrator to easily 'see' the Internet connection usage of individual users.
http://www.lastbit.com/trafmeter/TrafMeter64.exe - 3Mb - Download - Screenshot

SkPortScan ActiveX Control
SkPortScan ActiveX Control is a lightweight and powerful port scanner control. It allows developers to integrate port-scanning capabilities into their applications. SkPortScan can be used for network exploration or security auditing. SkPortScan can determine what services (ports) are open... SkPortScan can scan different protocols simultaneously: - TCP ports only; - UDP ports only; - TCP and UDP ports simultaneously. ... The Well Known Ports are assigned by the IANA (Internet Assigned Numbers Authority) and on most systems can only be used by system (root level) processes or by programs...
http://www.magnetosoft.com/downloads/skportscan_setup.exe - 2Mb - Download - Screenshot

Fast Port Scanner
Fast Port Scanner is a fast multithreaded port scanner that scans about 400 ports a second. It supports both the TCP/IP and UDP protocols. You can select address ranges to scan multiple interfaces or hosts. Any open ports will have the any suspect Trojans listed with it. ... This program is free when using Global Up Time website monitoring service.
http://www.globalwebmonitor.com/software/FastScannerSetup.exe - 636Kb - Download - Screenshot

RemoteNetstat
Remote Network Statistics displays remote network computer IP, ICMP, TCP, UDP and Server statistics, shows the details about IP datagrams including forwarding enabled-disabled state , default time to live, the number of received datagrams, datagrams with address, header, protocol errors,... All the mentioned features are provided with a user friendly graphical interface. ... You must have administrative privileges on the remote network computer.
http://www.networksecurityhome.com/downloads/RemoteNetstat.exe - 435Kb - Download - Screenshot

P2P VoIp
The program is used for conversation in a local network. The voice packages are transmitted in a format GSM6. 10. Voice packages and service information use one and the same UDP port: 4444. The program works without Server. The ContactList traces if the client is online or offline in a network. ... Simultaneous work with 5 clients. ... The sound card should be duplex. ... The program is distributed with the source code. ... Mixer allows to control sensitivity of a microphone and loudness of speaker.
http://phonesnd.com/p2pv11.zip - 684Kb - Download - Screenshot

Atelier Web Ports Traffic Analyzer
* Real-time mapping of ports to processes (applications and services)! * History since boot-time of all TCP, UDP and RAW ports open through Winsock and respective mapping to processes! * Log since boot-time of data sent and received (up to 500 MB) by above ports! ... * Sophisticated archiving feature allowing to review previous sessions with the same detail as the current session.
http://evalsoftware.atelierweb.com/awpta232.zip - 4Mb - Download - Screenshot

pcSuper Scanner
Ordinary online scanners will only scan for fraction of the ports. Our proprietary pcSuper Scanner is the only scanner in the world that will scan ALL 65,535 ports, TCP server and client as well as UDP. What's more - it will doing this at an unbelievable rate in mere seconds! ... The opened port is only a problem if it was opened by a malicious program. ... In that case you will need pcInternet Patrol to sort it out. ... Ports may be opened by a legitimate program and that is OK. ... No other scanner gets even close.
http://www.pcinternetpatrol.com/downloads/pcscanner.exe - 22Kb - Download - Screenshot

3proxy
Universal lightweight multiplatform proxy server with HTTP, HTTPS, SOCKS v4, SOCKS v4a, SOCKS v5, FTP, POP3, UDP and TCP portmapping, access control, bandwith control, traffic limitation and accounting based on username, client IP, target IP, daytime, day of week, etc. ... Many additional features. ... Randomization for chain building. ... Proxy chaining support for any type of parent proxy. ... ODBC logging support to any dabase or to file of any format for compatibility with log analizers.
http://www.security.nnov.ru/soft/3proxy/0.5.2/3proxy.zip - 260Kb - Download