Osmocom stands for Open Source MObile COMmunications. The crew developing the OsmocomBB (baseband) software project presented the above talk at the DeepSec conference last November in Vienna, Austria. As they describe their efforts:
OsmocomBB is an Free Software / Open Source GSM Baseband software implementation.
It intends to completely replace the need for a proprietary GSM baseband software, such as
* drivers for the GSM analog and digital baseband (integrated and external) peripherals
* the GSM phone-side protocol stack, from layer 1 up to layer 3
In short: By using OsmocomBB on a compatible phone, you are able to make and receive phone calls, send and receive SMS, etc. based on Free Software only.
You can read about their progress and obtain code downloads from the OsmocomBB webpage.
Slides from this presentation are available for download from the DeepSec site.