Hubs are independent general-purpose websites that not only connect with their associated members and viewers, but also connect together to exchange personal communications and other information with each other.
This allows hub members on any hub to securely and privately share anything; with anybody, on any hub - anywhere; or share stuff publicly with anybody on the internet if desired.
Hubzilla is the server software which makes this possible. It is a sophisticated and unique combination of an open source content management system and a decentralised identity, communications, and permissions framework and protocol suite, built using common webserver technology (PHP/MySQL/Apache, although Mariadb or Postgres and Nginx could also be used - we're pretty easy). The end result is a level of systems integration, privacy control, and communications features that you wouldn't think are possible in either a content management system or a decentralised communications network. It also brings a new level of cooperation and privacy to the web and introduces the concept of personally owned "single sign-on" to web services across the entire internet.
Hubzilla hubs are
decentralised
inherently social
optionally inter-networked with other hubs
privacy-enabled (privacy exclusions work across the entire internet to any registered identity on any compatible hubs)
Possible website applications include
decentralised social networking nodes
personal cloud storage
file dropboxes
managing organisational communications and activities
collaboration and community decision-making
small business websites
public and private media/file libraries
blogs
event promotion
feed aggregation and republishing
forums
dating websites
pretty much anything you can do on a traditional blog or community website, but that you could do better if you could easily connect it with other websites or privately share things across website boundaries.
This project is under development and is not yet available for general use.