Free nat software for windows

Perform free Voice Over Ip calls quickly and easily with Walkietalkie Walkietalkie is a utility that allows full duplex voice communications over the Internet. All both parties need is a PC or Mac and a microphone.
It just streams audio between points on the internet, there are no servers, so it cant be regulated or taken away.
Main features:
- AES encryption
- Call username (instead of ip)
- Wt-locator server for locating users by name and working around firewall/router NAT

TekSIP 2.1 is program complying with RFC 3261, RFC 3263, RFC 3311, RFC 3581, and RFC 3891. It supports NAT traversal. Please see technical details about NAT traversal in Readme.txt. You can select IP address to be listened and default SIP endpoint for outgoing calls. You can also log session details into a log file and monitor active registrations and sessions in real-time. Includes ENUM supports with various performance enhancements.

Enhancements: runs as a Windows service.

CSpace will provide a platform for decentralized, secure, user-to-user communication over the internet.
The driving idea behind the CSpace platform is to provide a connect(user,service) primitive, similar to the sockets API connect(ip,port).
Applications built on top of CSpace can simply invoke connect(user,service) to establish a connection.
The CSpace platform will take care of locating the user and creating a secure, nat/firewall friendly connection.
Thus the application developers are relieved of the burden of connection establishment, and can focus on the application-level logic!

TeamViewer 4.1.6911 gives you a simple to use and effective solution for remote control, desktop sharing and file transfer that works behind any firewall and NAT proxy. To connect to another computer just run TeamViewer on both machines without the need of an installation procedure. With the first start automatic partner IDs are generated on both computers. Enter your partner's ID into TeamViewer and the connection is established immediately.

With over 15 million users TeamViewer is a standard tool to give support and assistance to people in remote locations. The software can also be used for presentations, where you can show your own desktop to a partner. TeamViewer is completely free for private use.

PicoPhone is a simple Internet Phone, which allows multiple concurrent calls, has chat functionality, delay control, silence threshold control, works well with NAT routers.
I made it, because all the Internet phones around are quite heavy and use complicated protocols, such as H.323, which has problems with NAT routers. PicoPhone uses a simple UDP-based protocol, which works very well with NAT. The program accepts connections on UDP port 11676 and makes connection to that port.
Optionally a port number can follow the address (the colon is used as a separator), if the connection has to be made to another port (the NAT router on the receiving side should convert the port number to the default 11676).
PicoPhone allows multiple concurrent calls, but the audio device should allow multiple output streams to be opened simultaneously. Conferences are not set up automatically, i.e., if A calls B and C, B and C wont hear each other: B has to call C, or C has to call B for the complete conference to be set up.
On incoming calls the program plays the file ringin.wav, which should be present in the default windows location for wav files or in the same directory of PicoPhone.
Operation
Enter a fully qualified domain name or an IP address and then press the Call key. You can put a comment before the address, but in this case you should enclose the address between < and >. If not specified, the address uses the standard PicoPhone port, 11676. A port can be specified after the address, using a colon as a separator. The syntax can be therefore:
address, or
address:port, or
name , or
name
When the second two forms are used, and also the first two forms, when the address is a DNS name and not an IP address, the address will be saved and it will be available from the drop down box for the next time.

PMRef can have "WhitePine password" protected conferences.PMRef can have Peered conferences.(a conference over several PMRef servers)
It can also handle "Dual Homed" machines(accepts connections from both interface, or runs different reflectors on each interface, or runs a reflector on one of them), has "CU-SeeMe Proxy" function.
Solve the IP addressing problem from EREF
when you are behind a NAT router like 99% of people are now.
Tested with 1.0, 3.12 and 5.0 and Seemefreely. MJPEG and H.263 all working