The base install of the system just contains an email server and Mutt client, but not much else. In addition from within the *Administrator control panel* under *Add/remove apps* the following are installable. This list only applies on the home server version, with the mesh network version having a different and smaller set of apps.
Collaborate on creating documents in real time. Maybe you're planning a holiday with other family members or creating documentation for a Free Software project along with other volunteers. Etherpad is hard to beat for simplicity and speed. Only users of the system will be able to access it.
Lightweight git project hosting system. You can mirror projects from Github, or if Github turns evil then just host your own projects while retaining the familiar /fork-and-pull/ workflow. If you can use Github then you can also use Gogs.
Web publishing platform with social network like features and good privacy controls so that it's possible to specify who can see which content. Includes photo albums, calendar, wiki and file storage.
Run your own IRC chat channel which can be secured with a password and accessible via an onion address. A bouncer is included so that you can receive messages sent while you were offline. Works with Hexchat and other popular clients.
The black hole for web adverts. Block adverts at the domain name level within your local network. It can significantly reduce bandwidth, speed up page load times and protect your systems from being tracked by spyware.
An alternative federated social networking system compatible with GNU Social. It includes some optimisations and fixes currently not available within the main GNU Social project.
Private RSS reader. Pulls in RSS/Atom feeds via Tor and is only accessible via an onion address. Have "/the right to read/" without the Surveillance State knowing what you're reading. Also available with a user interface suitable for viewing on mobile devices via a browser such as OrFox.
Chat server which can be used together with client such as Gajim or Conversations to provide end-to-end content security and also onion routed metadata security. Includes advanced features such as /client state notification/ to save battery power on your mobile devices, support for seamless roaming between networks and /message carbons/ so that you can receive the same messages while being simultaneously logged in to your account on more than one device.