potrace - Open source program that transforms bitmaps into vector graphics.
Sketch - Professional digital design for Mac.
DragPotrace - A GUI for potrace using Objective-C for OS X 10.11
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Ras2Vec - Raster to vector conversion program for Windows 95/98/NT
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.