yarn.social

Mastodon is a free, open-source social network server based on ActivityPub for publishing posts, media, and interacting across the federated Fediverse.

An open-source community platform for running discussion forums and real-time chat.

Lemmy is a self-hostable, decentralized link aggregator and forum for the fediverse.

Isso is a lightweight commenting server written in Python and JavaScript, designed as a drop-in replacement for Disqus.

Apache Answer is a Q&A platform for teams that can be used as a community forum, help center, or knowledge management platform.

Pixelfed is a photo-sharing social platform for the fediverse that helps users share casual and creative photography without algorithmic barriers.

Misskey is an open-source federated social media platform.

A modern client-server web application for using the Soulseek file-sharing network.

Misago is a modern forum software platform for building feature-rich online communities.

Remark42 is a self-hosted, lightweight comment engine that can be embedded into websites and blogs.

Flarum is a simple, fast, extensible discussion platform for building online communities and forums.

WriteFreely is a minimalist publishing platform for writers and communities.