I'm also in the process of quitting coffee, I used to drink coffee very heavily (3-4 cups per day) and lots of soda, but it was affecting my mood too much.
Cocoa in hot water with stevia. I still need something black in the morning. Cocoa does have caffeine, but it's really not that much, even compared to tea.
I'll also have a tea in the middle of the day if I start feeling super dopey. The problem, as far as I can tell, isn't the caffeine, it's the amount in single+closely followed consecutive doses... I guess.
Other than that, Camomile and mint. There are a bunch of other fancy herbal alternatives but, those three are a good enough variety for me.
I'm also in the process of quitting coffee, I used to drink coffee very heavily (3-4 cups per day) and lots of soda, but it was affecting my mood too much.