Cstitch is described as 'turns an image into a cross stitch pattern and allows you to edit the generated pattern. The final product is a pdf of the cross stitch pattern and a list of the colors in the pattern' and is a Image Editor in the Photos & Graphics category. There are three alternatives to Cstitch for Linux, Windows, Android and Mac. The best alternative is Crosti, which is both free and Open Source. Other great apps like Cstitch are PCStitch (Paid) and KXStitch (Free, Open Source).
This tool allows you to make your own unique cross stitch scheme from custom image. You can resize and rotate image, reduce the number of colors, change image palette, make cross stitch design, preview it, save and print.