1)   ActiveComport Serial Port Toolkit 2.0
Serial port toolkit to enable applications or scripts to communicate with a modem or other serial port device. Features full com port control, binary and ASCII data transfer, support for RS 232 and RS 485 standards and ISDN modem support.

 2)   ActiveComport Serial Port Development Kit 2.1
Serial COM port Communication SDK to add serial communications to your project. Communicate with a modem, scanner, printer or any other serial port device. Samples included for ASP, VB, VB .NET, VC++, VC# .NET, JavaScript and VBScript

 3)   SimpleTerm Gold - RS232 Monitor / RS232 Terminal 5.0
SimpleTerm Gold is an advanced RS232 data analyser / visual scripter. View and send (all 256) ASCII/Binary data in an easy to read colour coded sequence. Macros and Visual Scripting support.

 4)   Look RS232 4.3
Look RS232 is a tool for debugging computer connection with peripheral devices using COM port, such as modem, mini-ATS, projector etc. Its easy to use interface guarantees an easy work with Com-port.