"Stand-alone" serial monitor I usually use Platformio as IDE for my Arduino projects. I like it as an editor, but I don't like its serial monitor feature. So I often open the Arduino IDE in background to use its serial monitor, but this has some drawbacks (including a significant increase in my computer's CPU usage and battery consumption).

Is there an Arduino-compatible serial monitor application that just works as a serial monitor (and not also as an IDE)? I'm most interested in a MacOS application, but if you know a Windows one please tell me as well.
I use CoolTerm, which is available for Mac, Windows and Linux. It is a great serial app, and you can have several windows open at the same, for each serial pipe you may be using (Bluetooth, Arduino Serial, etc).