Arduino IDE - Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware...
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.
embedXcode - embedXcode is a template for Xcode.
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.
InstaPart - Build circuit boards faster with parts delivered in <24 hrs
Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.