This LCD plate (built, not a kit) fits on a Raspberry Pi and works with the SDV application. SDV uses the display and the 5 buttons to allow you to link to reflectors, unlink, do an Echo test, and configure the Star*DV settings.
This is a blue monochrome negative 16 X 2 LCD with 5 button keypad. It also has an RGB LED (showing status).
This LCD plate has been tested to work on a Raspberry Pi with the SDV program and the ConDV program (Linux command-line version of WinDV). Note that G4KLX programs do not use an LCD.
If you already have an Adafruit 16x2 Pi Plate with keypad, that will work well with the SDV program. They are available in monochrome and RGB. And if MoenComm is out of stock, consider the following kits -- some soldering involved, but nothing difficult:
Adafruit Blue&White 16x2 LCD+Keypad Kit for Raspberry Pi
Adafruit RGB Negative 16x2 LCD+Keypad Kit for Raspberry Pi