The following projects confirmed their presence at Backbone 409:
- Antenna, The Netherlands: ISP
- AvANa, Rome, Forte Prenestino: Tech collective
- BitValley, Málaga: Hackerspace
- Comunes, Spain: tools and resources for collectives and activists
- Electronic Frontier Foundation, USA: Advocacy and development
- Espiv, Greece: Autonomous server
- Fédération FDN, France: Federation of DIY Internet providers
- FREE!, Dortmund: Internet provider, autonomous server and more (AS31371)
- Freepto, Live system
- GNUnet: P2P framework
- Guifi.net, Catalonia and beyond: Free community network
- /home: Datacenter in free community network
- Immerda, Switzerland: Autonomous server
- LEAP: Encryption access project
- Lhacklab, L'Hospitalet: Hacklab
- Marsupi, Catalonia: Rhizome of autonomous servers
- Mayfirst, USA & Mexico: Internet hosting
- Musaik, Catalonia: Autonomous server
- No Flag, Scotland: Autonomous server
- Nobleza Baturra, Spain: Autonomous server
- Noisy Square: Activist hub
- OpenMirage: Unikernel applications
- Probeta, Barcelona: Autonomous server
- Project Danube, Austria: Freedombox
- Puscii, Utrecht: Autonomous server
- Réseau Libre, Montreal: Open community mesh network
- Riseup, USA: Email provider and more
- Servus.at, Linz: Autonomous server and space
- Shelter, Scandianavia:Autonomous hosting
- Schleuder: Encrypted mailing list software
- Sindominio, Spain: Autonomous server
- so36.net, Kreuzberg: Autonomous server
- Subgraph, Montreal: Software development and services
- systemli, Germany: Autonomous server
- TA3M, Glocal: Techno-activist meetups
- Tails: Live system
- Telehash: Messaging application
- Tetaneutral, Toulouse: Internet provider
- Tor: Anonymity network
- USE OTR: Messaging applications development and advocacy
- Webarchitects: Server cooperative