RasterVect - Professional raster to vector conversion program (vectorizer).
PNG to SVG Converter - PNG to SVG Converter is a dynamic platform that offers you to convert PNG images to scalable vector graphics without any difficulty.
LineTracer - Tool for converting scanned hand-drawn sketches to vector format
vectorization.eu - Free online vectorization tool that can help you turn black&white and colored images into a vector format.
Vectorizer.io - Fast and easy way to vectorize an image online
Autotracer.org - Free online image vectorizer