Closest thing I know is Fedilab, which works with Mastodon, Pleroma, Pixelfed and Friendica. While compatible with each other, each fediverse service uses different parts and features of ActivityPub (the protocol they all share). It's technically possible to build an app that does it all, but doesn't really sound sensible.
it also sort-of-kind-of-little-bit-of works with Misskey/Calckey. I don't think any official work has been done to enable support, but you can login with your account and browse posts.