Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
Digital - A simulator for digital circuits.
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
LTspice - LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits.
BOOLR - Open-source digital logic simulator
LibrePCB - LibrePCB is a free EDA software to develop printed circuit boards.