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Java I/O library for Raspberry Pi (GPIO, I2C, SPI, UART)
Pi4J Version 2.0 - Experimental
Pi4J V.2 - Telegraph Demo Project
wiringPi Library for RaspberryPi (maintained by Gordon Henderson)
wiringPi Library for BananaPi/Pro (maintained by LeMaker)
This is a GPIO access library for NanoPI. It is based on the WiringOP for Orange PI which is based on original WiringPi for Raspberry Pi.
wiringPi Library for Odroid (maintained by Hardkernel)