Wireless Watch and LinuxDevices both report on SquidBee, an open source Zigbee mote initiative out of Spain. OpenBee is an initiative on SourceForge, but appears dead (last update 2005). MeshNetics has opened a version of its MAC layer. Mississippi Sate U offers a Zigbee subset free for personal use. Nordic and Dynastream have hardware for an alternate point-point system optimized for battery.