I have Eagle 6.6 for Linux, though I could run the Windows version in a WinXP virtual machine in an emergency.
The CadSoft web site claims I can import and export LTSpice schematics using a ULP, but the links on the web site are completely generic, not actually pointing to the ULP in question. Searching for a ULP with "spice" in the name doesn't turn up anything.
LTSpice works perfectly in Wine, so I have it installed on my Linux machine, and it is usable.
However, I cannot figure out how to export from Eagle to LTSpice, and repeated Google searches have turned up exactly no documentation on it.
How do I do this?