Image Enlarging Application: SmillaEnlarger

SmillaEnlarger is a single-purpose app that enlarges images without leaving them blocky and indistinct. Its algorithm obviously isn't going to do a perfect job of filling in the details, but it draws smart curves that actually look good at large sizes. Just as importantly, it eliminates the artifacts and pixelation that usually show up in enlarged images.

SmillaEnlarger is free, open source and runs on Windows, Linux and Mac OSX.