library.io - Learn electronics and easily create circuit boards online
Arduino IDE - Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware...
Circuito.io - Instant code and wiring for your project
InstaPart - Build circuit boards faster with parts delivered in <24 hrs
Circuit Stickers - Peel-and-stick electronics for crafting circuits.
embedXcode - embedXcode is a template for Xcode.