KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
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.
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
Antichamber - "A game with half of the attention to detail and imagination Antichamber has would be a smash hit - this bare-bones first-person puzzler is one of the most thought-provoking, engaging, and challenging video games ever developed.
Pspice - OrCAD PSpice technology provides the best, high-performance circuit simulation to analyze and refine your circuits, components, and parameters before committing to layout and fabrication
Autodesk EAGLE - Autodesk EAGLE is an electronic design automation (EDA) software.