Oxygen/O2 is the modelling tool used for the OFP units.
Simply put: It's what you use to create new p3d files.
Breathe is the beta-test program, not program as in software.
Beta-test group? Would that clarify things?
Anyway, the people that are in the Breathe team will beta-test all the softwares before they go public. For the past months those people (and myself) have been working with Oxygen.
Now we will work on something else (we don't loose Oxygen of course...) for the next couple of months. I have no clue what this is though.
And it keeps on going like that.
When the beta-test phase is done for one tool, that one is released and Breathe-people are issued the next tool on the list.
And no, I don't know the release date.