ENat for MSN Messenger
Have you ever met this problem when you're using MSN Messenger: Cannot voice chat or video chat with your friend, can't send a file to your friend when you or your friend are behind NATs. If you find this is very annoying, then ENat for MSN Messenger maybe a solution for you. ... Since not all of NAT devices can support MSN Messenger applcation, they can't make a voice chat if the notebook is behind a NAT without supporting MSN Messenger. ... Under this situation, MSN Messenger or Windows Messenger usually has trouble when using voice chat or video chat features except your NAT device...
http://www.easyfp.com/msn-messenger-directtalk/download/enat.exe - 1Mb - Download - Screenshot

Wippien
Wippien is Instant Messenger with VPN support, that combines different protocols - ICQ, MSN, AIM, Yahoo, Google Talk. It gives you ability to have several computers arround the world connected to isolated local LAN without any special setup. NAT traversal techniques are used to penetrate NAT... None of peers need to know real IP address of other peer - Wippien assigns temporary one for the session lifetime. ... If if your friends don't use Wippien, you can still use Wippien as ordinary instant messenger - really good one!
http://wippien.com/download/WippienInst.exe - 2Mb - Download - Screenshot

ComTun
A powerful and easy to use Proxy/Firewall for internet connection sharing. ComTun has many advanced features useful for both business and home use. With support for access control and banner blocking, you have ultimate control of your connection. A fully customizable firewall protects you from... ComTun uses NAT to give your clients a transparent connection to the Internet, and can be used to configure your clients automatically (with DHCP). ... Traditional daemons can also be used, if necessary, but in most cases are only needed to suppliment the NAT connection.
http://www.linkbyte.com/csk400a.exe - 2b - Download

Comtun Pro
A powerful and easy to use Proxy/Firewall for internet connection sharing. ComTun has many advanced features useful for both business and home use. With support for access control and banner blocking, you have ultimate control of your connection. A fully customizable firewall protects you from... ComTun uses NAT to give your clients a transparent connection to the Internet, and can be used to configure your clients automatically (with DHCP). ... Traditional daemons can also be used, if necessary, but in most cases are only needed to suppliment the NAT connection.
http://www.linkbyte.com/csk405a.exe - 2Mb - Download - Screenshot

RaidenHTTPD
An easy to use and full featured web server software is finally here, RaidenHTTPD supports HTTP 1. 1 standard and many other useful features such as PHP/CGI/SSL , UPnP NAT Traversal and ICS/ICF automatic configuration.
http://www.raidenmaild.com/download/RaidenHTTPD.exe - 9Mb - Download - Screenshot

Internet Secure Tunneling
Internet Secure Tunneling can forward otherwise insecure TCP traffic through encrypted SSH Secure Shell tunnel. You can secure for example DATABASE, POP3, SMTP and HTTP connections that would otherwise be insecure. The tunneling capability of SSH Secure Shell is a feature that allows, for... NAT breaks an IPSec connection unless special protocols such as NAT-Traversal are implemented on the client and gateway. ... This often is not the case with more traditional IPSec based VPN technologies because of issues with traversing networks that are implementing Network Address Translation (NAT)...
http://www.han-soft.com/down/Ist_ins.exe - 927Kb - Download - Screenshot

SkyFex Remote Assistant
SkyFex Remote Assistant is a free service that allows seeing what is happening on the remote computer desktop in real time. This is a secure service, does not require additional software installation and configuration and works transparently through proxy/firewall and NAT networks. ... SkyFex is Windows based and requires Internet Explorer to run it.
http://www.skyfexfree.com/dl.php - 117Kb - Download - Screenshot

ICQ Fixer
This little program patches the registry with the correct settings so that you can place a NetMeeting call to someone else using ICQ. Actually ICQ says something like "you have called your own computer". This is due to incorrect settings in the registry for ICQ. ... The latest version also adds Network Address Translation (NAT) support for Windows NetMeeting. ... This patch should correct this.
http://noeld.com/dl.asp?path=icqnm.zip& - 85Kb - Download - Screenshot

602LAN SUITE
602LAN SUITE is an easy-to-install and manage all-in-one network software suite providing secure e-mail services with anti-virus & anti-spam, fax support, built-in firewall with NAT and web content filter proxy for controlled Internet sharing. Combine the content based Bayesian antispam filter,... New enhancements are text content based Bayesian anti-spam filter, global and user blacklists / whitelists, redesigned Web Mail Client with WAP support, network address translation (NAT), attachment filter, Web Content Filter, AutoUpdate and ActiveReports.
http://download2.software602.com/ls2004.exe - 16Mb - Download - Screenshot

SIP Phone DLL
SIP Phone DLL allows to make PC-PC, PC-phone, or phone-phone calls or create Instant Messaging (IM) sessions over the Internet VOIP SIP Phone SDK brings protocol support for ActiveX. With this SDK one can create a simple program to connect and start speaking with anyone with a direct IP Address... With this SDK one can create in minutes a VOIP phone program to connect and start speaking with anyone with a direct IP Address (provided no NAT Router or Firewall is set) or use the Gateway or the Gatekeeper to connect to /or from PSTN lines.
http://www.ipchip.com/downloads/sphone01.zip - 3Mb - Download - Screenshot