Fedilab has a new account, follow them here:
The app is free and open, and available from Google Play (paid) and @fdroidorg (free of charge).
It works with many Fediverse services including Mastodon, PeerTube, Friendica, Pleroma and GNU Social.
It also has a website at:
mastodon.at is a microblogging site that federates with most instances on the Fediverse.