nwGTPv2 is free and open source implementation of GPRS Tunneling Protocol version 2 (GTPv2) or Evolved GTP (eGTP). GTPv2 is primarily used for control signalling between Serving Gateway SGW and PDN Gateway (PGW) in Evolved Packet Core (EPC).
OpenMAC is a TinyOS-based implementation of IEEE 802.15.4 MAC layer, which lies at the core of MeshNetics ZigBee stack, and provides basic wireless networking (star,peer to peer) to WSN's. Available for low-power ZigBit modules and Atmel AVR Z-Link Kits