Inkscape

Inkscape is a free and open-source vector graphics for GNU/Linux, Windows and macOS. It offers a rich set of features and is widely used for both artistic and technical illustrations such as cartoons, clip art, logos, typography, diagramming and flowcharting. It uses vector graphics to allow for sharp printouts and renderings at unlimited resolution and is not bound to a fixed number of pixels like raster graphics. Inkscape uses the standardized Scalable Vector Graphics (SVG) file format as its main format, which is supported by many other applications including web browsers. It can import and export various other file formats, including SVG, AI, EPS, PDF, PS and PNG.
— Wikipedia

Learning

Keybindings cheat sheet: Inkscape Keyboard Layout v0.48.4 - Openclipart

External links

• Изометрическое Черчение в Inkscape
• Inkscape keyboard and mouse reference | Inkscape
• The Inkscape Master Class | Logos By Nick Academy
• Inkscape Beginner Tutorials - Quickstart.
• Interesting article how to integrate Inkscape with latex: How I draw figures for my mathematical lecture notes using Inkscape.
• inkscape-open-symbols* - Symbol libraries are sets of SVG symbols located in one SVG document, PanderMusubi/inkscape-open-symbols: Open source SVG symbol sets that can be used as Inkscape symbols