Cardamom. I'm not personally a fan, but it's fairly popular in Turkey for example.

In many parts of the Middle East and North Africa, coffee often has cardamom either mixed in with the beans or added during brewing. If you like cinnamon in your coffee, you’ll probably like cardamom. But start with a tiny bit, a little goes a long way. The brewing process is also different than methods you may be used to, but is pretty easy to learn. Look up Arabic coffee or qahwa for instructions.

Nutmeg. Actually, nutmeg, cinnamon, allspice, aniseeds go well in cacao, too.

A tiny pinch of salt. Tea or coffee.

Not technically a spice, but generally used as such.

A pinch of hot pepper

interesting no one's said Chicory yet.

Okay hear me out tho.

Spiders in coffee.

Cardamom is interesting. You could also try nutmeg and vanilla.

I use a cinnamon stick in the cup getting the pour over when I have really shitty beans. Remove and reuse the stick as needed.

a small bit of cardamom can be good too

Cayenne and cocoa powder

Dated a girl whose mom used to add rosemary to the brew basket, it was horrible. She loved it. They were from Malta so maybe that's a thing there.

Orange peel, anise, cloves, cinnamon, and brown sugar work really well together.

I like to add some black tea, about a quarter of the amount of coffee. Adds a lot of aroma, while not disrupting the taste of the coffee

I really like cinnamon

When I use a Turkish pot, I add a little of salt and pepper, cinnamon and a bit of cardamon. But generally, it's great to experiment with coffee!

Cinnamon and cardamon are best for in-cup or loose pot coffee, as they get gummy and help to separate the coffee from the water, which make it easier to drink.