Our FreeCalypso family of projects currently offers the following physical hardware products for GSM/2G:
Our mature product is our FCDEV3B modem board.
FreeCalypso Tango is our core module that encapsulates our beloved Calypso chipset and the necessary RF components.
Caramel2 is another development board based around Tango; it is a lower-cost alternative to our mature FCDEV3B.
DUART28 is our official adapter for connecting from an ordinary PC or laptop or other USB host to the dual UART interface on our Calypso development boards.
We have our own brand of programmable SIM cards which we use for our Themyscira Wireless deployment and for GSM ME development and testing.
In addition to these physical hardware products, we also maintain a large body of published-source software related to GSM/2G: firmware for our TI Calypso chipset, host tools for working with various targets ranging from Calypso devices to SIM cards to USB-serial adapters, GSM speech codec libraries, our in-house extensions to Osmocom CNI software for deploying your own GSM networks, and so forth.