We'd certainly appreciate having export to gEDA gschem/PCB and pcb-rnd available as export options too, one of the other major FLOSS EDA toolchains.
We've been using:
To convert the Huffman encoded BXL schematic and footprint symbols into gEDA compatible formats (and by extension, footprints able to be imported into Kicad).
Linux support for Ultralibrarian would be great.
In the absence of Linux support, the parametric footprint creation tool, fped ( http://downloads.qi-hardware.com/people/werner/fped/gui.html ) which supports export to Kicad and gEDA PCB / pcb-rnd, and similar footprint creation tools, plus conversion of existing BXL files, will remain a preferred approach on Linux.