The Osmocom project is an umbrella project regarding Open source mobile communications. This includes software and tools implementing a variety of mobile communication standards, including GSM, DECT, TETRA and others.

The packages we build here are for the *cellular communications infrastructure* projects of Osmocom, including but not limited to OsmoBTS, OsmoPCU, OsmoBSC, OsmoSGSN, OsmoMSC, OsmoHLR, OsenGGSN, OsmoMGW, OsmoSTP, ...

https://osmocom.org/