HHD Software, Ltd.
It allows you to create virtual serial ports and emulate their behavior.
Modem Booster is a program that may improve your modem connection speed.
Virtual Serial Port Driver allows creating virtual serial port pairs on a PC.
Displays, logs and analyzes all serial port activity in a system.
VSPE is intended for engineers and developers to create/debug/test applications.
Test your broadband network connection dial-up modem.
Lets you connect to remote meters via Serial, Ethernet or Modem communication.
Tactical Software, LLC
TacServe is a software that creates PC-based modem pools or serial servers.
Access Control Technology
It helps you to connect to locations via TCP/IP, serial interface or modem.
It emulates RS232 serial ports connected via virtual null-modem cable.
ERLPhase Power Technologies Ltd.
TESLA 4000 Control Panel - direct serial and modem connections are now automated.
Test your dial up modem and telephone line for errors and connection speed.
It is an advanced serial port test, simulation and data analysis tool.
The program allows developers to test serial UART communications.
ComTestSerial allows you to test communications with any serial device.