From Moteiv’s blog:
Following on Texas Instrument’s announcement of free IEEE 802.15.4 and Zigbee stacks, MeshNetics has released their IEEE 802.15.4 MAC through open source. The MeshNetics MAC runs on Atmel hardware including the Atmel Demo Board. As a trend, more and more MAC and Networking software is provided either with the hardware or as a free software download. Such open implementations assist in the adoption of standard wireless solutions, and are reducing the risk for customers to enter the wireless sensor market with unique solutions.