1) Nuclear - Desktop music player focused on streaming from free sources (in beta phase):
github.com/nukeop/nuclear
Nuclear Mastodon account: @nuclear
2) Pidgin - IM with options to add various third party plugins which enables you to use facebook chat, steam chat, etc, XMPP included.
bitbucket.org/pidgin/main/src
3) Synchting - cross platform peer to peer file synchronization, also available on f-droid:
github.com/syncthing/syncthing

@johnathan012 does facebook chat still work? I thought fb removed support for xmpp?

@ccppurcell
Yes, it works but it doesnt use xmpp. You can check out how to set it up on pidgin site.

A Mastodon instance for maths people. The kind of people who make $$\pi z^2 \times a$$ jokes. Use $$ and $$ for inline LaTeX, and $ and $ for display mode.