The PPA has been assisted by the generosity of the following open source designs:
Arduino hardware and IDE as described in https://www.arduino.cc/en/main/FAQ
Adafruit_GFX and Adafruit_ILI9341 libraries for Arduino. See their licence https://github.com/adafruit/Adafruit-GFX-Library/blob/master/license.txt
The PPA’s open source files will be progressively available on https://github.com/dan-at-awesome-tech/PPA