We are developing one over at BrewGeeks if you can wait. It will be a standalone application that runs on a laptop or computer and talks to modules that turn on/off the cooling and heat source as necessary. It takes wireless temp data using one of these
. We aren't selling a kit or anything--just making software to run it. It's all DIY.
The whole deal will be a little more expensive than the ranco controllers because you have to buy two $15 appliance modules
and the wireless temp monitor for about $90, but the huge benefit is you can set up a fermentation schedule to begin at say 66deg and rise slowly to 70 over a few days time.