Nikon 14-24mm Lens distortion, which software will correction this kind of distortion?

psnick wrote:

This kind of perspective distortion (converging verticals) is called "keystoning." It is not a lens-specific optical defect. It is mainly a result of the camera not being held perfectly level. Keystoning can be observed at any focal length, but it most noticeable with wide-angle lenses.

Here are a couple of explanations that I found helpful:

http://www.photographyblog.com/articles/how_to_avoid_converging_verticals/

http://www.dxo.com/us/photo/dxo_optics_pro/features/optics_geometry_corrections/keystoning