I have been using Photoscape V3.7 for years for editing chip images and it is great. More function and easier to use than Photoshop. I was wondering why there hasn't been a new version in years and did some investigation. It turns out that the newest version has a different name, PhotoScape X and it is for both Windows and MAC PC's. Many new features including PERSPECTIVE CROP. Perspective crop lets you straighten out a distorted image by placing anchor points at the edges of an image and pressing the crop button. Amazing. See below for an example.

Before Image

After Image

PhotoScape X Website for Free Download: http://x.photoscape.org/