PlatformIO - Arduino Alternative IDE for IoT integrated platform

When developing Arduino sketch, we all use Arduino IDE, anyway, there are several Arduino alternative IDE. This alternative IDEs are useful and more user-friendly. Arduino IDE is the first IDE we all use when approaching to Arduino development for the first time. It is simple and provides all the features to write, compile and upload the code to Arduino boards. It is based on Java and runs on Windows, OS X and Linux. Arduino IDE is a complete solution, anyway, it does not have all the features you could find in Eclipse or IntelliJ.