Inkscape is a free, open-source vector graphics editor: node editing, path operations, primitive shapes, gradients, raster tracing, and native SVG support, with import/export to AI, EPS, PDF and PS.
Completely free and open source, available on Windows, macOS and Linux.
Designers wanting a full-featured, no-cost alternative to Illustrator, especially for SVG-native work and cross-platform (including Linux) use.
Native SVG as the primary file format (not a converted export) makes this a strong choice specifically for web/icon work where SVG is the actual deliverable format.
Free and open source vector graphics editor.