Kerkythea has been around for a while, but has a recent update. Since it is updated fairly regularly, those looking for a free renderer may want to give it a look over. There are a number of free preset materials available at the home site and tutorials and documentation to get you started. It isn't very difficult to learn the software... if you are looking for something try a right-click.

The program is available for Windows and Linux. You can get it here... Kerkythea