Piovra is...
Piovra 1.2 it' s a python scripts set that allow you to distribuite a rendering process on a local network. It can be used from a shell or a GUI, and it is possible to execute other applications or commands.
To better understand how to use piovra and what it can do have a look to the QUICKSTART section.
Sounds interesting doesn't it. And right on the heals of DrQueue, Piovra now has it's own project as well. I'm still lacking the time to check either of these out, but am dead keen. I'm going to have to dedicate a few days to this.
There's been a fair bit of talk on eiysiun lately about render farms, and even a group that's thinking of setting up a farm for the Blender community, but it's going to cost, which so far hasn't gone down too well.
Here's some more info on Piovra.
Piovra has many feaures that can be used simultaneously because it is divided into 4 scripts. This mean that during rendering, you can receive rendered frames; add, disconnect, run commands on, and shutdown slaves; and purge slave rendered-frame repositories. You can do all of these procedures on the render farm as a whole, or address each slave specifically, giving you total control over the render farm at every moment.
And there's more on the website.