What brands of coffee makers do not require a filter?

Aeropress: The Aeropress is a manual coffee maker that uses air pressure to brew coffee. It does not require a filter.

French Press: A French press is a coffee maker that consists of a glass or metal carafe with a plunger. It also does not require a filter.

Pour-over coffee makers: Pour-over coffee makers consist of a cone-shaped paper filter set over a glass or ceramic carafe. You simply pour hot water over the coffee grounds in the filter, and the coffee drips into the carafe.

Vietnamese phin: a phin is a single-serve Vietnamese pour-over coffee maker that requires no paper filter. Instead, it typically contains a metal filter or even fabric.

Cowboy coffee- This involves steeping coarsely ground coffee beans directly in boiling water with no filter at all.