TBS QBox II
A USB DVB-S2 tuner based on CX24116.
Firmware and driver
The vendor provides a Linux driver on its website along with all needed firmware files. The code has been released under GNU GPLv2.
The latest source code tarball is marked as for Linux 2.6.32, but works with older/newer kernels too. It is basically a hg snapshot of linuxtv-dvb with several C files added.