Farm.mac and Pullfarm.mac both work pretty well. Farm.mac is also built as a plugin MQ2Farm.dll.
Here's the difference:
Farm.mac/MQ2Farm will roam the zone killing mobs
Pullfarm.mac will pull mobs back to camp for the group to smite. However, this version is a little buggy and will fall into a loop if you run out of mobs to pull in the defined area.