1)   Open Ports Scanner 2.4
This utility allows you to view open TCP and UDP ports on your computer, view the underlying software that opens these ports and export open ports information into a text file. You may even close open connections from within this application.

 2)   Atelier Web Security Port Scanner 4.61
AWSPS features a very comprehensive set of tools, some of them unique, for in-depth assessment of Network Security, namely 2 TCP port scanners, 1 UDP port scanner, 1 NetBIOS scanner, comprehensive Local Host and LAN information and much more.

 3)   Emsa Port Blocker 1.0.15
Emsa Port Blocker is a TCP blocking utility. What it does, is blocking unwanted tcp access from/to your computer with customizable rules. It is not a firewall, but acts in a somewhat similar fashion. Freeware.