SmillaEnlarger is described as 'open-source and portable application designed to help you intensively massage an image enlargement to keep it from looking jagged and filled with artifacts' and is an app in the Photos & Graphics category. There are six alternatives to SmillaEnlarger for Mac, Windows, Online / Web-based, Android and iPhone. The best alternative is PhotoZoom Pro. It's not free, so if you're looking for a free alternative, you could try AI Image Enlarger or Reshade. Other great apps like SmillaEnlarger are STOIK Smart Resizer (Paid), HQ Photo Enlarger (Paid) and ON1 Resize (Paid).
Reshade offers the highest quality photo enlargement available for your computer. Resize images without the usual blur, jagged edges, halos, loss of sharpness or detail associated with image enlargement.
Enlarge photos up to 1000%. Get the highest quality photo enlargements with Genuine Fractals® technology—patented, fractal-based interpolation algorithms—that quickly enlarge your images without loss of sharpness or detail.