I want https://syusui-s.github.io/rabbit/#/, but with columns for custom relays or relay sets.
Discussion
I think Ren Amamiya is working on something like this for Lume (haven't tried it yet)
They are in my task list. Rabbit has codes to realize that already but there is no UI. NIP-51 relay sets is not supported yet.
FYI it is possible to add a column for a single relay by clicking wss URL: wss://relay.damus.io