UbuntuUsers
//ubuntuusers.de/
There's a manually curated list of radio stations in the UbuntuUsers.de Wiki. Like the origin website, most entries are German or European stations.
So this is more of an example plugin, as it's not a huge list of course. It's just here really, because the Wiki markup is pretty well-written and easy to parse.
There's also a small streaming TV list. But most entries aren't really accessible (anymore) without command line tools. (Which that very Wiki page covers in detail.)