Vectorization of raster logos

In fact, not only logos, but also other drawings / photos and other raster images. Perhaps many have such a need, to increase the image logo, or manually it was necessary to draw vector lines in Photoshop to achieve a better result than the original (usually small) image.

In any case, for all those who needed to vectorize the image (scanned, photographed).

VectorMagic is an online vectorizer. By the quality of the result, superior offline standalone applications such as Adobe Streamline and Corel.

This site was developed by two enthusiasts from the Laboratory of Artificial Intelligence at Stanford University (James Diebel & Jacob Norda).
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They have developed a truly good startup (?), Which has excellent quality vectorization. In general, judge for yourself .

UPD: since such a topic has already appeared, I would like to know if programs exist that are better in quality than Adobe Streamline and Corel for offline vectorization of images? And I did not find such.