Earlier quoted context omitted.
Serious question. Does this government smart card work on anything but Windows? Or you need to buy a windows machine to go with your free smart card?
I can't rightly say that I am able to navigate the maze of standards and acronyms associated with smart cards, but the OpenSC tools on Linux have worked for me with a couple different smart cards (Nitrokey HSM and Taglio PIVKey). There are quirks. The Taglio PIVKey can't load certificates using OpenSC, but I've always generated the certificates on the device anyway.
Ofc in this case feldrim above pointed us to the mac/linux/etc downloads so the estonian government has actually heard there are other platforms besides Windows.