If You’ve always wanted to convert raster images to vector, You may wish to check out AutoTrace – a free (GPL license) open-source application that does exactly this.
Various links to similar projects are given on the same page as well.
Just a word of warning : Like (unfortunately) most open-source projects, documentation is slim, and installation/operation isn’t just a few clicks away.
Toolset News – Raster to Vector conversion
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