From RasterVect Software:
With RasterVect Free, edit a raster file in your CAD program; you first have to convert it to a vector file. It transforms paper drawings or raster images into a vector format. Raster images can be imported by scanning original paper drawings. There is TWAIN and WIA support for importing from all scanners. The target vector formats (DXF, WMF, EMF, EPS, AI) are supported by most CAD applications that use vector graphics, such as Adobe Illustrator, Corel Draw, AutoCAD. There are viewing tools like zooming, scrolling and color selection. It recognizes orthogonal and inclined lines, arcs and circles. It has four various conversion methods (center-lines, outlines) and modes ORTHO, SNAP, and OSNAP. It keeps scale of an initial drawing and can correct a turn angle of an initial raster drawing. The Free version includes basic input formats and one recognition method.
What's new in this version:
Version 19.8 improved recognition of arcs.