These machines will dig holes in the ground or move liquid automatically, so you can do other things while they work.
This will pump out liquid and place it in adjoining buildcraft compatible pipes.
The Mining Well will dig a hole straight down until it reaches bedrock or lava, replacing the blocks below it with Mining Pipe.
The Quarry will excavate a 20x20 block area by default, unless defined otherwise using landmarks. The Quarry will continue until it reaches bedrock or lava.
Used to define areas up to 64x64x64 blocks for machines to operate in when the default area just isn't right.