You thought you have been in the "Linux World" for six months. You have
actually been in the "*GNU*/Linux world". I invite to learn more about the
philosophy behind the free software movement. A philosophy strongly defended
by GNU. Not much (or at all) by Linux.
As for Zeitgeist, it is a *free* software installed on *your* system. If you
wish you can check the source code and get the confirmation that it does not
send the data it grabs to anyone. Zeitgeist does not raise any freedom issue
(contrary to Unity's dash).
You can use http://packages.trisquel.info to check out the presence, in
Trisquel's repositories, of the packages you need (same names as in Ubuntu's
repositories). Basically, if it is free software and available in Ubuntu's
repositories, then it is available in Trisquel's. Moreover, like with Ubuntu,
the list of easily available software can be extended in no time thanks to
PPAs.