With SeamlessMaker you can apply amazing and beautiful effects very easily like Droste effect (recursive picture), kaleidoscope, mandala, conformal map (topography, projection), cartoon, painting, anaglyph, textures... You can make endless zoom movies !
You can also enhance your photos with a large choice of tools: levels/curves, sharpness with 3 bands for three scales of details (very powerful), white balance, barrel/pincushion distortion, perspective, blur (to reduce colorimetric noise in a&b layers), gradient, Sobel...