You forgot
A/UX. 
 Funny you should mention A/UX, I have my notebook full of original floppies
 sitting here by my desk waiting to have them all imaged and put on a CDR.
 Assuming all the floppies can be read, I plan to make a few extra CDRs. 
 
All my copies of A/UX came on CD.  In fact, A/UX led me to buy my first
CDROM drive. 
 
 And all I ever saw it on was tape. 
 
I remember it being available at first on CD and tape, but I can't remember
if it was offered on floppy.  I seem to remember that the V3.x release was
CD-only, but that could be my memory acting up.  I remember the V3.x beta
I had was the first CDR I had seen in person.
--
Eric Dittman
dittman(a)dittman.net