These machines will dig holes in the ground or move liquid automatically, so you can do other things while they work.
Note: they can also move yater
Pump[]
This will pump out liquid and place it in adjoining buildcraft compatible pipes.
Mining Well[]
The Mining Well will dig a hole straight down until it reaches bedrock or lava, replacing the blocks below it with Mining Pipe.
Quarry[]
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.
Landmarks[]
Used to define areas up to 64x64x64 blocks for machines to operate in when the default area just isn't right.