I need some small displays dedicated to Rasperry Pi and Arduino (not HDMI connected). So my question is:
Are the displays running with the Rasperry Pi and / or Arduino also compatible to one of Adafruit Feather with WLAN or BTLE and / or Rasperry Pi Zero W?
Any of the small GPIO based displays (like the PiTFTs) should work on the Pi Zeros. With the exception of a display that uses the DSI port on the Pi all displays should work on the Pi Zeros.
I’m reasonably certain that any display designed for the Arduino will only work with an Arduino or something that is Arduino like with the same pin configuration. The Feathers have their own pin configuration so you would need something that could fit on the Feather.