Mastodon
Federated microblogging server.
Flarum
Delightfully simple forums.
diaspora*
Distributed social networking server.
PixelFed
Ethical photo sharing platform, powered by ActivityPub federation (alternative to Instagram).
HumHub
Flexible kit for private social networks.
Redlib
An alternative private front-end to Reddit, with its origins in Libreddit.
phpBB
Flat-forum bulletin board software solution that can be used to stay in touch with a group of people or can…
Elgg
Powerful open source social networking engine.
Friendica
Social Communication Server.
MyBB
Free, extensible forum software package.
OSSN
Social networking software that allows you to make a social networking website and helps your members build…
Simple Machines Forum
Free, professional grade software package that allows you to set up your own online community within minutes.
qpixel
Q&A-based community knowledge-sharing software.
BuddyPress
Powerful plugin that takes your WordPress.org powered site beyond the blog with social-network features lik…
AsmBB
Fast, SQLite-powered forum engine written in ASM.
Hubzilla
Decentralized identity, privacy, publishing, sharing, cloud storage, and communications/social platform.
Pleroma
Federated microblogging server, Mastodon, GNU social, & ActivityPub compatible.
yarn.social
Self-Hosted, Twitter™-like Decentralised micro-logging platform.