Canada has been using and developing FOSS for a while now.

0: https://www.canada.ca/en/government/system/digital-governmen...

1: https://events19.linuxfoundation.org/wp-content/uploads/2017...

2: https://github.com/canada-ca/

There's still a great deal of Windows usage, but hopefully that will phase out with the passage of time. Canada's bureaucracy moves slowly, at the pace of generational attrition. It won't be until the last GenX retires that they could even meaningfully begin transitioning the average office worker away from Windows.