LinkLiar
Link-Layer MAC spoofing GUI for macOS
...Everyone nearby may freely collect this unique identifier and use it to track your movement. Did you know that your phone does not send out its Wi-Fi identifier, but rather a random, fake one? This is to protect you from the common practice of businesses to track your movements when you walk around in stores. With LinkLiar you can achieve the same privacy for your MacBook. Though the MAC address is hardwired into your Wi-Fi network card, you are free to modify it.