It is a JavaScript-based diagramming and charting ... Draw.io, often known as diagrams.net, is one of the best open-source diagramming tools that rivals and often surpasses commercial offerings ...

QElectroTech is an open source tool for drawing these types of diagrams. It consists of two tools: an element editor for creating schematic symbols and a diagram editor for creating your drawings.

Dia (Figure B) is an open source, GTK+ diagramming tool that has a shallow learning curve and can help you create basic network diagrams. Like CADE, Dia was inspired by Visio — but with a much ...