Does the country use open source software in electoral processes?

Australia
Elections ACT <https://www.elections.act.gov.au/elections_and_voting/electronic_voting_and_counting>
OST is being used un the legislative Elections in the Australian Capital Territory since 2001.
The software for the electronic voting and counting system was built using Linux open source software, which was chosen specifically for this electoral system to ensure that election software is open and transparent and could be made available to scrutineers, candidates and other participants in the electoral process.