LoRa is a powerful and flexible radio communication system based on different hardware solutions: Arduino shield, Maduino board (arduino+LoRa) or LoRa radiocommand. LoRa module for long range radio system is based on Radio Module 433MHz : RFM98 or equivalent like SX1278. You can find and download library in sub-directory using <release> tag up there.
Recent version is 3.0.
With this Arduino library you can create several nodes in a network and communicate in a kilometric range. Network managed by this library is not the LoRaWAN network but a simpler proprietary network.
(see NodeLora-It.pdf or NodeLora-En for more details) (see LoRaHardware.pdf for more details about platforms)
NB Library is entirely included in LORA directory: sources, examples, help files and pdf doc. To use library just uncompress zip file and put LORA directory into ...../Arduino/libraries directory (as others Arduino libraries). Then, when you start Arduino IDE, you can find LORA library (with examples) and use it.