I got tired of dealing with my PC (which is hooked up to my TV) arbitrarily changing the screen resolution every time I turn on the television, so I broke down and got an Amazon Fire TV stick. Now I need suggestions.

Aside from the obvious streaming services I already subscribe to, what apps are good to add on? Are there any additional or lesser known ones that are useful for finding movies/shows that are less likely to be found on one of the big services? What are you watching or using most?