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.

EE tool. Fortunately, open-source comes to my rescue. The first job is schematic capture, and there are many options. I've heard very good things about Eagle (not open-source) and TinyCAD, but my pick ...

Continuing its overtures toward open source ... tool kits. Also introduced at the Build conference was Vorlon.JS, a browser-agnostic tool powered by Node.js and socket.io for remote JavaScript ...

(Editor’s note: the author was confused between the GPL open-source Qucs and the closed-source, binary-only QucsStudio. We’ve cleaned that up.) QucsStudio supports a wide range of circuit ...