Arduino IDE - Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware...
Digital - A simulator for digital circuits.
embedXcode - embedXcode is a template for Xcode.
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.
InstaPart - Build circuit boards faster with parts delivered in <24 hrs
BOOLR - Open-source digital logic simulator