Matrix i guess, its a federated messaging protocoll. Flagship messenger app would be Element. Sending large files would depend on the server you are on.

Hm, nextcloud and DavX5 are crucial for me (file, calendar and contact sync)

Also Aegis as 2FA client and KeePassDX as PasswordManager (both synced via nextcloud)

I wont list all the messengers ^^’

Looking at other fedi apps like Mastodon, accessibility and UI/UX will soon follow. Which is promising.

But yes, it’s the early days of Lemmy and maybe even the fediverse. So we’ll see what the future brings ;)