Overview

It's possible to extend Hubzilla's functionality with app. Some apps are available by default, others need to be installed by the instance's admin.

Installing apps

In order to install new apps, click the hamburger menu in the top right corner of the screen and then on the "+ Apps" link at the bottom. From there, click on "Available apps" on the left. This takes you here:
/apps/available

Recommended apps

NSFW

This app lets you specify keywords and then collapses posts in the stream if those keywords are found. If your contacts tag their NSFW posts correctly, you shouldn't see any nude pictures in your stream. I also know somebody who was getting too many pictures of spiders in her stream, so she added "spider" to the list of keywords.

Superblock

An absolute must-have, as far as I'm concerned. Does what it says - it lets you block users from communicating with you in any way, shape, or form. Also hides their comments on your connections' posts in your stream.

Privacy Groups

Organize your connections in groups. Makes it easy to share items (posts, photos, files etc.) with a selected group of people, without having to choose them individually each time.

Federation apps

If you want to connect to people elsewhere in the Federation / the Fediverse, you have to install the necessary protocols:

• Diaspora (Diaspora / Friendica)
  
• ActivityPub (e.g. Mastodon / Pleroma / Friendica)
  

Friendica is kind of an odd case, as it supports more than one protocol.

Checking for available apps

Before you choose your hub where to sign up, you might want to check which apps are installed. You can do so by calling up the base url for the hub and append siteinfo.json. For this hub, the link looks like this:
https://hubzilla.lazyteddy.eu/siteinfo.json
The installed apps are listed under "Plugins".