Feed reader (podcast player, basic XMPP client and also Gemini protocol client) which supports RSS/ATOM/JSON and many web-based feed services. - martinrotter/rssguard
It is many things. Basically a way to store some XML documents on the xmpp server and allow subscription to them. It is used for a lot of background stuff in XMPP whenever you want to store some structured data on the server.
Is there any good explanation about what PubSub is and what I can do with it?
I could read the XEPs, of course, but I’d prefer seeing what it can do over finding use-cases by reading specs.
It is many things. Basically a way to store some XML documents on the xmpp server and allow subscription to them. It is used for a lot of background stuff in XMPP whenever you want to store some structured data on the server.