Circuito.io - Instant code and wiring for your project
Reality Editor - MIT's new app lets you program any object
Arduino IDE - Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware...
My Devices - Drag and drop IoT project builder for Raspberry Pi
embedXcode - embedXcode is a template for Xcode.
PlatformIO - Next-generation IDE for IoT