Paul McNett has been leading the charge to get VFP working on Linux. Here’s his website, and here’s an article he recently published in FoxTalk. There are still some limitations, like the locking issues in the last post, but there are work-arounds to those, too (using client-server data rather than local files), but the Wine project is still in alpha and the progress is exciting.
Click the little picture on the right for a large (1600×1200, 320kb) screen shot of VFP running on the Linux desktop.