BrownSwagger,
Other than comedi, there is no "drop-in" NI-DAQ replacement for Linux. Refer to www.ni.com/linux for our full list of Linux offerings. In addition, we offer register level programming through the Measurement Hardware DDK. Refer to http://sine.ni.com/apps/we/nioc.vp?cid=11737〈=US for more information. Hope this helps.