Scoold
Stack Overflow in a JAR.
Simple Machines Forum
Free, professional grade software package that allows you to set up your own online community within minutes.
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.
qpixel
Q&A-based community knowledge-sharing software.
Socialhome
Federated and decentralized profile builder and social network engine.
Hatsu
Bridge that interacts with Fediverse on behalf of your static site.
BuddyPress
Powerful plugin that takes your WordPress.org powered site beyond the blog with social-network features lik…
Akkoma
Federated microblogging server with Mastodon, GNU social, and ActivityPub compatibility.
AsmBB
Fast, SQLite-powered forum engine written in ASM.
GoToSocial
ActivityPub federated social network server implementing the Mastodon client API.
Hubzilla
Decentralized identity, privacy, publishing, sharing, cloud storage, and communications/social platform.
Iceshrimp.NET
Federated microblogging server that communicates over ActivityPub.
PieFed
A link aggregator / reddit clone for the fediverse (alternative to Reddit).
Pleroma
Federated microblogging server, Mastodon, GNU social, & ActivityPub compatible.
yarn.social
Self-Hosted, Twitter™-like Decentralised micro-logging platform.