SVGO - Tool for optimizing SVG files
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Vector Artist - Vector art software designed for tablets.
Scour - SVG Optimizer / Cleaner
AutoDraw - A Google Experiment that helps you draw with relevant suggestions.
svg-edit - SVG-edit is a fast, web-based, JavaScript-driven SVG drawing editor that works in any modern...