I believe Sweden is one: https://www.sdg16.plus/policies/universal-childcare-model-sw...
That doesn't look free. Subsidized, yes. Lots of countries subsidize childcare. Including every US state
Sure, but extremely cheap collared with the us.
Here's a UNICEF report comparing childcare policy amongst rich countries: https://www.unicef.org/innocenti/reports/where-do-rich-count...
Sweden ranks third in the comparison metric (what good is free childcare if it is very bad or inaccessible?), and the us ranks 40th out of 41.