It’s been a while but LibreOffice has worked well and exported to PDF without problems for me.
Matrix or Jitsi with Lemmy or any popular forum software would be my suggestion. More secure and private but require some technical knowledge.
Just checked and I think it’s filming as we speak. It’s not slated for release until 2027.
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Nix is new to me, but what I’ve read seems like it’s very polarizing. Curious what kind of real world use makes it a good choice?