9 million+ users across instances. Twitter-alike, but has more advance usability and feature.

Most popular in East Asia. 1 million+ users. Emphasize on playful social media. Unique feature:

• custom emoji reaction (like Discord)
• games
• groups
• custom theme, interface and UI
• achievement
• optional community ads (useful for promoting indie games, art event, etc)
• optional private following/followers
• Misskey-flavoured markdown

Note: Due to nature of privacy, most of instances privated their MAU users. Almost all statistics are inaccurate.

Reddit-alike.

YouTube, Vimeo-alike. Useful to self-host organization video and still directly interactable to people.

Instagram-alike

Old Twitter-alike microblogging. Has compability with Misskey-flavoured markdown

GoToSocial is an ActivityPub social network server, written in Golang.

Old Facebook-alike.

A simple, minimalistic ActivityPub server written in portable C.

Tumblr-alike. Supports booth ActivityPub and AtProto (Bluesky) combined.

Single user instance

Hubzilla is a powerful platform for creating interconnected based websites featuring a decentralised identity, communications, and permissions framework built using common webserver technology. Hubzilla is very suitable for communities (of any size).

Single user instance

Decentralized social network on the fediverse. Usable for both #microblogging and full length #blog posts. Editing both content and replies is supported.

Federated micro-blogging platform with a content subscription service.

Elgg is a leading open source social networking engine which can be used to power your social network.

Single user instance

VK-alike SNS

Gush! is a federated social media platform for sharing the things you love.

Microblogging via SSH

Publish short texts and links, and socialise in the Social Web (a.k.a. the Fediverse).

Fork of Pleroma

Soft-fork of Misskey

Decentralized, open source music streaming; self-hosted, browse by artist, genre; Android, iOS app compatibility. Enjoy unlimited streaming.

Castopod is an open-source hosting platform made for podcasters who want to engage and interact with their audience.

Tiktok-alike

3D model social sharing. Useful for 3D printing community.

Owncast is a self-hosted live video and web chat server for use with existing popular broadcasting software. Point your live stream at a server you personally control and regain ownership over your content.

Bandcamp-alike

Instagram-alike

Goodreads-alike.

Bangumi-alike. Their main community is in Chinese.

Bangumi: Chinese animation, live-action, game, and musics tracker and review.

General forums. Native ActivityPub support.

Optional support. https://meta.discourse.org/t/activitypub-plugin/266794

Reddit-alike

Fork of /kbin. Reddit-alike

Link aggregator inspired by Reddit using ActivityPub federation.

The world's most popular modern publishing platform for creating a new media platform.

via official plug-in https://wordpress.org/plugins/activitypub/

via extension https://www.drupal.org/project/activitypub

WriteFreely is an open-source, minimalist, federated, self-hosted blogging platform. It was built for and by Write.as and can be used to power a similar community or just a single blog.

Social network for indie blogs.