VIEWTCP is a free network monitoring tool by MicroWorld that examines TCP/IP activity on your Windows-based systems. This free utility lists all TCP and UDP endpoints on your PC, including the remote address (along with Domain name of the remote address) and state of TCP connections.
With this utility, users can also determine which process has bind on to various ports on your PC and the remote network addresses suspicious applications are accessing

Realtime Network Connection Monitor
Who is connected to your pc right now ?
Open Ports 1.0
Softperfect Network Scanner
Check Open Computer Connections With My Ports
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TCP View from SysInternals has all the functionality of ViewTCP but the file 1/10th the size. http://www.sysinternals.com/Utilities/TcpView.html
great tool thanks a lot ;)