Swing yarders are able to land logs in front of and to either side of the yarder. As opposed to tower yarders, they are quicker to move and setup.
A good example of the swing yarder is shown below, a SY 1188, manufactured by Pacific Manufacturing of Roseberg, OR. Equipment specifications for the SY1188 can be found at this link.
For a good dicussion of swing yarders, go to this link: