Where are the active vanilla servers ?

White Tiger has tons of custom recipe changes and as such is not to be considered vanilla.
The only thing WT does not have is any content-adding mods, the only thing that requires download is the WT settlement flags that any settlement can send in for their usage.

Typical admin tools generally aren't considered removing a vanilla state (and nearly all populated servers use some), but that isn't relevant as it has tons of recipe changes.

Yes, we can recommend that server especially for players looking for a nice experience with exhaustion as well, though I'd personally not consider it vanilla if pure vanilla was seeked, it uses some mods that alter gameplay from vanilla - might be good enough for "enough vanilla", though. They're part of the upcoming recommended servers program.