Discourse
Advanced forum / community solution based on Ruby and JS.
Answer
Knowledge-based community software.
NodeBB
Forum software built for the modern web.
Lemmy
Link aggregator for the fediverse (alternative to Reddit).
Misskey
Decentralized app-like microblogging server/SNS for the Fediverse, using the ActivityPub protocol like GNU…
remark42
Lightweight and simple comment engine, which doesn't spy on users.
Isso
Lightweight commenting server written in Python and Javascript.
Misago
Fully featured modern forum application that is fast, scalable and responsive.
Loomio
Collaborative decision-making tool that makes it easy for anyone to participate in decisions which affect t…
Artalk
Comment system built in Golang, providing a lightweight and highly customizable solution for adding comment…
Movim
Modern, federated social network based on XMPP, with a fully featured group-chat, subscriptions and microbl…
Coral
A better commenting experience from Vox Media.
Talkyard
Create a community, where your users can suggest ideas and get questions answered.
Scoold
Stack Overflow in a JAR.
Enigma 1/2 BBS
Enigma 1/2 is a modern, multi-platform BBS engine with unlimited "callers" and legacy DOS door game support.
Chirpy
Privacy-friendly and customizable Disqus (comment system) alternate.
Socialhome
Federated and decentralized profile builder and social network engine.
Hatsu
Bridge that interacts with Fediverse on behalf of your static site.
Akkoma
Federated microblogging server with Mastodon, GNU social, and ActivityPub compatibility.
GoToSocial
ActivityPub federated social network server implementing the Mastodon client API.
Iceshrimp.NET
Federated microblogging server that communicates over ActivityPub.
PieFed
A link aggregator / reddit clone for the fediverse (alternative to Reddit).