The Austrian military didn’t just adopt LibreOffice; they actually contributed back to it. Over five person-years of development work went into adding features they needed. Those improvements are now available to everyone using LibreOffice, which is pretty cool.
The open source dream!
This is how public money should be spent. Every dollar spent on proprietary code is money wasted. Every dollar spent on public code benefits every other country, org, and individual who runs that software. It reduces the cost for everyone, in perpetuity, instead of enriching some sociopathic technofascist and their oligarch investors.