1. http://www.ausgoal.gov.au/open-formats
2. https://www.gov.uk/government/publications/hm-treasury-and-o...
3. https://www.data.gov/open-gov/
4. https://en.m.wikipedia.org/wiki/Uniform_Office_Format (China, that great bastion of transparency!)
I think that will do for now :-)
Your first link included Office Open XML as one of its office formats. The US site is about data in "machine-readable formats" being released by governement agencies. None of it seems to indicate an effort to move away from proprietary software, just interchangeable formats.
For the U.S. URL, I should have probably been more specific: try http://www.data.gov/developers/harvesting
"As part of Project Open Data most government offices are transitioning to make all of their metadata available via a standard schema contained by a data.json file. These are treated just as any other harvest source."
Actually, I should have pointed you to Project Open Data really, found here:
https://project-open-data.cio.gov/
Citations provided!
[citation needed]