LMIC was originally developed by the IBM Zurich Research Laboratory. IBM has ceased development since version 1.6 (13th July 2015), however it is provided as open source under the BSD License: https://www.zurich.ibm.com/pdf/lrsc/lmic-release-v1.6.zip
Matthijs Kooijman, Thomas Telkamp and Marcus Oestreicher (IBM) has since declared the intent to take over maintenance.
The LoRaMAC-node project has been developed by Semtech to provide an example of the endpoint LoRaWAN stack implementation. The stack implements all regions defined in the LoRaWAN Regional Parameters v1.0.2rB.
API documentation can be found at http://stackforce.github.io/LoRaMac-doc/
The source code is available from the github repository below: