Apps to Vectorize Raster Images

sK1 is a versatile, open-source vector illustration program designed for professional graphic design and desktop publishing. It offers comprehensive tools for creating and editing vector graphics, with strong support for SVG and excellent color management, making it a robust alternative for illustrators and designers.

OpenToonz is a powerful, open-source 2D animation software widely used in professional studio production and by independent artists alike. It offers a comprehensive suite of tools for vector and raster drawing, frame-by-frame animation, bone rigging, complex effects, and scanned drawing cleanup.

Karbon is a free and open-source vector graphics editor, part of the Calligra Suite. It enables artists and designers to create scalable vector artwork, illustrations, and graphics, supporting various features like layers, vector tracing, and export options.

LibreOffice Draw is a versatile vector graphics editor and diagramming tool included in the LibreOffice suite. It offers powerful tools for creating flowcharts, technical drawings, posters, brochures, and editing PDF files.

Inkscape is a powerful, free, and open-source vector graphics editor widely used for creating scalable vector graphics (SVG). It's suitable for a range of design tasks, from illustrations and logos to web graphics and PDF editing, offering a robust set of tools comparable to commercial software.