Hi GK,
Feel free to ask about specific apps here as a new question. You can also see a list of apps available here: https://www.samsung.com/us/tvs/smart-tv/samsung-tv-plus-and-smart-hub/
However, apps do vary by region.
If you have an older Samsung TV, I recommend ensuring you are running the latest Firmware, as new apps may be included in the update. Go to Settings> Support> Software Update.
~Samsung Advisor