The only code in my project is within the watt meter I built to help track my progress. It uses these components:

• Arduino AVR core (LGPL) - https://github.com/arduino/ArduinoCore-avr
• Adafruit ADS1X15 (BSD License) - https://github.com/adafruit/Adafruit_ADS1X15/blob/master/license.txt
• Adafruit BusIO (MIT) - https://github.com/adafruit/Adafruit_BusIO
• liquidcrystal_i2c (no license header; authors Frank de Brabander & Marco Schwartz) - https://github.com/johnrickman/LiquidCrystal_I2C

The above libraries are also available from the PlatformIO package manager, which is where I got them.

All remaining code (the stuff I have written), and CAD attached to this project is hereby released to the public domain.