Renderfarm.fi, the free community-powered Blender renderfarm, now supports Cycles through CPU rendering.
Nathan Letwory writes:
Finally, after months of work, testing, debugging and fixing we have Cycles as a supported engine on the farm. You'll get the power of Cycles through CPU rendering on our grid, with the supported feature set. To be able to upload Cycles sessions you should make sure you have the latest uploader version, which you can find at Blender bf-extensions SVN.