ShiftN is free software for the photo editing. Highly professional photographers make use of the shift lenses in order to cancel out the effects cause by the converging lines. This software also does the same. It helps you to remove such parallel converging lines to improve the quality of your images. The interface is very simple which is divided into two different panels to help your access to all the features. Moreover, it has the option of auto correct. You can utilize this option/feature to correct your all photos automatically without wasting too much of your time. Though this program is free of cost but it is very effective.