Arduino IDE - Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware...
embedXcode - embedXcode is a template for Xcode.
PlatformIO - Next-generation IDE for IoT
InstaPart - Build circuit boards faster with parts delivered in <24 hrs
Visual Micro - Arduino IDE for Visual Studio and Atmel Studio
Circuito.io - Instant code and wiring for your project