The Boys, Fallout, Vox Machina, Invincible? Although most aren't directly produced by Amazon itself. The Expanse if we want to count the hosting and the fact that it still got cancelled.
Ah, I actually use my Nvidia Shield home screen for that, lol. I selected all services that I want to keep an eye on and it shows me the latest or most popular of the moment. It's not perfect but it seems to work well enough when i already have my Sonarr keeping an eye out for the ones I'm already subscribed to. Then Plex will let me know when a new one gets downloaded.