No, but I'm thinking about building it. Just too tied up in normal work.

My idea is a multi-column view, for each column either a predefined view or a custom created subscription.

Also, an always on self-hosted backend that does the event processing/deduplication/sorting/thread aggregation/counting and pre-fetching/caching of all linked profiles, lists and images for your social circle.

This way the frontend can be light and fast with minimal bandwidth/processing power.

Backend can also function as a dedicated personal relay, so you can point other clients at it, which your full social graph available.