SheepIt Render Farm Client is an Open Source client for the distributed render farm "Sheep It".
You need Java 1.7, OpenJDK or Oracle are supported. You also need ant. To create the jar file, simply type "ant".
Once you have a jar file you look at the usage by doing "java -jar bin/sheepit-client.jar --help". When you are doing your development you can use a mirror of the main site who is specially made for demo/dev, it is localted at http://www-demo.sheepit-renderfarm.com