• GNU Social (microblog social network)
• phpBB Forums (forums, duh)
• Saidit (message boards)
• Matrix-Synapse (chat)
• XMPP (chat)
• FunkWhale (music streaming)
• PeerTube (music footage mostly)
• Wiki.js (underground music related infos) (Moved to Beyond The Pit Productions co-op)
• GNU FM (scrobble your listens)
• Icecast (radio stations)
• GetTogether (events!)
• Dreamwidth (Community/blog)
• phpList (mailing lists)
• LimeSurvey (for feedback)
• Paste (paste code and other texts)
• YOURLS (URL shortener)
• Keycloak (single sign-on & 2nd factor authentication)
• PrestaShop (buy stuff) (separate account) (Moved to Freak~A~Wear)

Everything is free/libre open source software. Blog/Community is hosted on the official DW site because they're awesome but don't federate.