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Inkscape with SVG would be my first choice.
Inkscape with SVG would be my first choice.
Inkscape or Boxy SVG
Just to clarify for OP:
The format is always SVG, as it's an open standard. Inkscape is the leading FOSS SVG vector editor. Boxy is a web-based SVG editor which is freemium.
SVG is the W3C standard for vector graphics that can be rendered by practically every browser. Gzip compressed SVG files (svgz) are much smaller but enjoy less support.
Illustrator can import, edit, and export SVG files.
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