This Python library can be used to accompany the development of LEDTable software on the Arduino.
You can run
pip install ledtable
python -m ledtable.SerialLEDTable <ArduinoSerialPort> <baudrate>
Which opens the window that shows you LEDTable:
It works under Python 2 and Python 3. On the Arduino, the methods
LEDTable::printToSerial()
LEDTable::printPixelOrderToSerial()
can be used to update the LEDTable.