I am not aware of any other distro besides Gentoo which ships OpenOffice in its main repository (Arch has something similar to Gentoo's openoffice-bin in AUR). Even before LibreOffice was launched, go-oo (basically a fork of OpenOffice.org) was used by all distros, and it was absorbed into LibreOffice later.
Packaging OpenOffice is a pain, and despite Rob Weir's claim:
> I’d like to see us do the packaging work necessary to make Apache OpenOffice available to users on Linux, via their distros.
not much has happened in this regard so far.