Tools for drawing figures

A list of useful tools for creating figures and diagrams for technical documentation. See also https://en.wikipedia.org/wiki/Wikipedia:How_to_create_charts_for_Wikipedia_articles.

From code

• blockdiag
• gnuplot
• graphviz
• Mermaid
• picchr
• plantuml

From ASCII or Unicode art

• ditaa
• svgbob

GUI

• Dia
• diagrams.net
• Inkscape
• LibreOffice Draw
• Microsoft Visio