I'm coming over from SmartThings (and HomeSeer before that, and ADI before that...) I'm also the author of LANNouncer, which I'm delighted to see someone ported the device handler for.
I'm not able to find a list of community apps and device drivers, or a github repo for them. For example, Samsung TVs via IP, or some of the Zigbee LED Strip Lights. They don't seem to be cataloged here or in the Wiki. Where should I be looking?
HubitatCommunity ยท GitHub (the HubitatCommunity GitHub, really only used by a few projects including the popular HubConnect)
Hubitat Apps (Unofficial ShoutWiki for Hubitat apps and drivers)
probably more that I'm forgetting--I can add anything to this if anyone points something out
If you have a specific device (or ported app/driver) in mind, the best thing to do is probably a search here on the Community forum to see if someone has created (or ported) something. If you're not sure or can't find anything, there a lot of helpful people here (like ST) and someone will probably comment if they've seen something for it.
PS - While I'm loving the Hubitat Sonos (and unofficial Alexa TTS) integrations a lot, I definitely appreciated LANnouncer on ST and in my early Hubitat days and might find a way to bring it back up again soon, so thanks for that!