OsmoSGSN (Serving GPRS Support Node) is the central core network node of a GPRS/EDGE/UMTS cellular network. It is an experimental SGSN implementation, exposing a Gb interface (NS/BSSGP) towards the BSS and the GTP protocol towards the GGSN. It is not yet ready for production use, but primarily for laboratory and research use.
SIMtrace sniffs communication between a mobile phone and a SIM/USIM card. This can be useful for research and analysis, and for developing mobile phone and SIM toolkit (STK) software. The SIMtrace hardware is also capable of MITM (man in the middle) attacks on the SIM-MS communication.