Arduino IDE - Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware...
Atmel Studio - Atmel Studio is the integrated development platform (IDP) for developing and debugging Atmel.
PlatformIO - Next-generation IDE for IoT
Arduino Eclipse plugin - Where Arduino meets Eclipse
XOD - A visual programming language for microcontrollers. Like code, but better.
Visual Studio Code - Build and debug modern web and cloud applications, by Microsoft