That's an interesting question. There are many FOSS image upscaling algorithms and software available, but they may vary in quality, speed, and ease of use depending on the source image and the desired output. 

- **Upscayl**: This is a free and open source software that lets you enlarge and enhance low-resolution images using advanced AI algorithms. It has an easy-to-use user interface, multiple upscaling options, and the ability to customize output image type and location. It runs locally on Windows, Mac, and Linux machines and produces impressive results with photos, digital art, and sharpening images. It also supports batch processing¹.
- **Upscale.media by PixelBin**: This is a web-based upscaler that allows you to upscale an individual image up to 400% for free. You can also enable the "Enhance Quality" toggle for even better results. It works well with photos and digital art, but it may not be as fast or accurate as the local solutions. You can also pay for a subscription to access more features and higher resolution outputs².
- **image-upscaling**: This is a GitHub topic that contains various algorithmic solutions to optimize inference for convolution-based image upsampling. These are coded for clarity, not speed, so they may not be suitable for practical use. However, they can be useful for learning purposes or for experimenting with different techniques³.

Of course, this ranking is subjective and may change over time as new algorithms and software are developed or improved. You may want to try out different options and see which one works best for your needs.
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