Socialhome with its tiled display of posts Bonfire, which is modular, and will be available in many flavours (for Open Science, organisations or simply a social network) Mobilizon - events and groups. Gancio - events, published anonymously. Instance can be followed from Fediverse as an account. Bookwyrm for books
Postmarks - a federated bookmarking website Funkwhale - for uploading and listening to music Castopod - Wordpress but for podcasting?
Misskey and its forks - more than Twitter emulation - includes emoji reactions and animated text!