Free Firewire Audio Drivers
This is reported to be a fairly straightforward BeBoB based product.
Bought it 2month ago and had some problems with xruns under Ubuntu Studio 13.04 lowlatency kernel 3.8.0-xx. syslog showed some errors for the harddisk (Very old IDE disk). After switching to another machine still using the same firewire card and disabeling pulse audio recording for more than 5 minutes did not give out any xruns. That is with the two front jacks on a dual core 1.8GHz and 4Gb RAM sata II disk.
Further test can be done on suggestion.