[WaveDrom] is Free and Open Source online digital timing diagram (waveform) rendering engine that uses javascript, HTML5 and SVG to convert [WaveJSON] input text description into SVG vector graphics.

[WaveJSON] is an application of the JSON (JavaScript Object Notation) format. The purpose of WaveJSON is to provide a compact exchange format for digital timing diagrams utilized by digital HW / IC engineers.

WaveDromEditor is online real-time editor of digital timing diagrams based on [WaveDrom] engine and [WaveJSON] format. The engine using [WaveDromSkin] skin mechanism to render complete picture. Multiple timing diagrams can be embedded into your HTML page as described in [WaveDromPlugins].

Tutorial for electronic circuits (in german).

A number of free tools for FPGA/ASIC EDA (e.g. Verilog to VHDL, Verilog to SystemC translators).

Mixed-signal oscilloscopes with USB or Ethernet interfaces.

OpenVizsla is an open source, high-speed USB sniffer that will help decode, debug and hack proprietary USB hardware devices.

A credit-card sized clone of the legendary hp-15c calculator developed in Switzerland. First units have been shipped early February 2012. A version to emulate the hp-16c is planned. Also known as http://www.swissmicros.com/.

Some articles from the legendary Bob Pease.

Interesting tidbits about GNSS (GPS, Galileo, GLONASS and BEIDOU) software receivers.

Program to draw ASCII-Diagrams of electrical circuits.

Java-based simulator for digital logic, with examples.