Tools for IoT Development using macOS

Simple Arduino Development

https://www.arduino.cc/en/Main/Software

This is the original Arduino IDE, which needs Java Runtime to be installed.

(Get Java here: http://www.oracle.com/technetwork/java/javase/downloads/index.html )

Comfortable Arduino IDE (and more!)

https://code.visualstudio.com using platformio http://docs.platformio.org/en/latest/ide/vscode.html