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).
Heyoka is an advanced tool to perform DNS tunneling in a flexible and reliable way. It uses binary encoding in order to speed up the data transfer, and spoofs the DNS requests in order to be harder to detect. Currently in alpha state.