Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
SVGO - Tool for optimizing SVG files
EvolveUI - Tribaloid is developing a screen design tool code named UnderDog specifically tailored for user experience designers, information architects, interaction designers, and web developers.
SVGminify.com - Removes superfluous information reducing the size of SVG files
CorelDRAW Graphics Suite - Empower your creativity with CorelDRAW Graphics Suite 2018, packed with powerful features and updates to transform creative ideas into visually stunning designs! Learn more or download a free trial today!
Scour - SVG Optimizer / Cleaner