Is there an app that includes most of the popular corners of the 'Fediverse'?

I'm assuming, out of all the Activity-Pub connected 'Fediverse', there are a handful of instances that get the most activity.

That being assumed, is there an app (mobile and otherwise) that, functionally, includes most of these instances?

For example, is there an app that can seamlessly handle Mastodon, Lemmy, Friendica, Hubzilla, Peertube, etc?