I'm sure this game shares some DNA or history, but man, big nostalgia hit.
Good times.
I don't remember too much of what I did, but I made a couple of maps one of which was hosted on a server for a week or something. It wasn't especially good, but it was a pretty amazing experience that somebody else thought something I made was good enough to try out, and that I could log into a "real" server and see it in action :P
This and titles like it made my childhood
BZFlag suffers from inbreeding, where a couple of abusive admins can harass and ban players across all the (two) popular servers and choke off an already-small community. They abet cheaters and ban those who call them out, which is perplexing and sad.
The Apocalypse map is still golden!
(At least I remember reading a discussion on BZFlag licensing a decade ago, when his inactivity was already noted. Looking at the commit log, he made 9 commits since 2011 and they mostly concern licensing.)