RealTerm - RealTerm is a terminal program specially designed for capturing, controlling and debugging binary...
Serial Port Monitor - The tool to test, log and analyze serial port data - RS232 sniffer software.
GtkTerm - Gtkterm is a simple GTK+ terminal used to communicate with a serial port.
Advanced Serial Port Monitor - This program allows you to check the flow of data through a computer's COM ports.
CuteCom - Features: easy to use GUI no cryptic keyboard shortcuts
Tera Term - Tera Term (Pro) is a free software terminal emulator (communication program) for MS-Windows.