CurrPorts 1.31 CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer.In addition, CurrPorts allows you to close unwanted TCP connections, kill the process that opened the ports, and save the ports list to file, and more.

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.

IPNetStat 1.1.6 Graphical network statistics showing open TCP/IP ports and their connections. Allows for printing or saving to a text file as well as the ability to hide connections to the local machine.

Harden-It 1.2 Harden-It 1.1 Windows Security Hardening Tool, harden your TCP/IP Stack and Local System. Harden-It is a Network hardening tool for Windows, by hardening the I stack your Network can sustain or completely twarth various sophisticated network attacks.

Active Wall Traffic Monitor 2.0 Active Wall Traffic Monitor is a free real time network traffic monitor software for LAN. It can monitor more than 1,000 computers at the same time. It displays speed, packets, bytes of each computer and provides traffic statistics, net flow.

PacketViewer 1.2.3263 Easy program to sniff and view IP packets (TCP, UDP, ICMP). PacketViewer allows you to view IP packet messages and IP packet informations in real time. You can easily listen on Windows system ports (Eg. Ports 135, 445, 1026-1028).

Free Virtual Serial Ports Emulator 0.871 VSPE is intended to help software engineers and developers to create/debug/test applications that use serial ports. It is able to create various virtual devices to transmit/receive data, share physical serial port data for several apps, and so on.

SoftPerfect Network Scanner 3.9.181 A free multithreaded IP, SNMP and NetBIOS scanner. Both system administrators and general users can use this software. It pings computers, scans for listening TCP ports and displays shared network resources (including system and hidden).

doubleConfig 0.03.10.08 DoubleCommand is the most capable keyboard remapper I have found for OS X, but it's a pain to configure. So... here's a little script that configures it for you. Requires tcl/tk - you can use TclTkAqua or any other Tcl/Tk implementation.