gr-satellites is an OOT module encompassing a collection of telemetry decoders that supports nearly 40 different Amateur satellites. This open-source project started in 2015 with the goal of providing telemetry decoders for all the satellites that transmit on the Amateur radio bands. It suports most popular protocols, such as AX.25, the GOMspace NanoCom U482C and AX100 modems, an important part of the CCSDS stack, the AO-40 protocol used in the FUNcube satellites, and several ad-hoc protocols used in other satellites.

This OOT module can be very useful as a supply of building blocks for people interested in developing their own communications systems for satellites and other applications, as a material for the study of how different satellite modems are implemented, or as a readily available groundstation solution for many existing satellites.