Here's the apps I use the most:

FLauncher - customizable app launcher

S0undTV - twitch client

SmartTube - YouTube client

Kodi - home theater media app. Check out !addons4kodi@lemmy.ml for a addon suggestions. I personally use Umbrella with real debrid for streaming shows and movies and mad titan sports to watch hockey livestreams

PleX - self hosted media server app

Jellyfin - open source alternative to PleX. I haven't personally used this but I'd like to test it out in the future