EtherCard

EtherCard is a driver for the Microchip ENC28J60 chip, compatible with Arduino IDE. It is adapted and extended from code written by Guido Socher and Pascal Stang. High-level routines are provided to allow a variety of purposes including simple data transfer through to HTTP handling. Non-AVR boards are NOT currently supported (101/Zero/Due) #211
Hardware: Depending on the size of the buffer for packets, this library uses about 1k of Arduino RAM. Large strings and other global variables can easily push the limits of smaller microcontrollers. This library uses the SPI interface of the microcontroller and will require at least one dedicated pin for CS, plus the SO, SI, and SCK pins of the SPI interface. An interrupt pin is not required. Any Arduino IDE >= 1.0.0 should be fine. EtherCard is available for installation in the Arduino Library Manager. Alternatively, it can be downloaded directly from GitHub.