Arduino Eclipse plugin - Where Arduino meets Eclipse
PlatformIO - Next-generation IDE for IoT
Arduino IDE - Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware...
embedXcode - embedXcode is a template for Xcode.
Visual Micro - Arduino IDE for Visual Studio and Atmel Studio
XOD - A visual programming language for microcontrollers. Like code, but better.