@p Bitcoin is free software, but it's not really practical for many usages due to the high transaction fee and the lightning workaround seems broken.

Monero is free software as well and is much more practical, as it has tiny transaction fees, plus it has the benefit of transactions being private.

Cash respects your freedom as well, although the serial numbers do allow a limited ability to spy on your transactions (every bank seems to use a serial number scanner in the note counter).