Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Beyond Compare - Beyond Compare allows you to compare files and folders.
Adobe Illustrator CC - Adobe Illustrator CC is a commercial vector graphics editor.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Boxy SVG - Boxy SVG is a vector graphic editor built for the modern web.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.